If my income depended on getting the perfectly captured money-shot, I'd use digital:
Nikon D5: 12fps, with AF and AE tracking
Canon 1DX Mk II: 14 fps, with AF and AE tracking
Sony A9: 20fps, with AF and AE tracking
To me, timing is always more critical than a high fps count. I learned that the hard way, unfortunately. There are few things more disappointing than getting back a box of slides and finding that not one of the high-speed motor drive shots caught the precise moment. With good timing, no motor drive is necessary. I get the shot I want and I don't have to wade through dozens of also-rans. Further, focusing accuracy is also more important than a high fps count. In this respect, the F5 and F6 will handle any focusing chore you can probably imagine. So digital is not necessarily a requirement.
That said, I shoot motorsports and find 3fps the maximum I want to use.
Back in the 80s and early 90s, I freelanced as a motorsports photographer. Back then almost all the cameras I used had motor drives, but the cameras I used most were the old Canon F1s. Those giant Motor Drive MFs weren't good for much more than 3.5fps, so I never counted on them for capturing the action. Instead I used them so I could keep the viewfinder up to my eye. And I took my exposures one shot at a time, waiting for the precise moment. You'll excuse me, I can't resist dropping in a couple of photos. And no, that first photo isn't a crop. It was a lucky shot is what it was.
March 83G. IMSA Race, Riverside International Raceway, 1986. Canon F-1, Tamron SP 60-300mm f/3.8-5.4, Fujichrome 100:
Group 44 Jaguar XJR-7, IMSA Race, Riverside International Raceway, 1986. Canon A-1, Canon nFD 200mm f/2.8, Fujichrome 100
Okay, okay -- since this thread is about the F3, here are a couple of shots I took at the 1990 Chino California Airshow. The lens was a Tamron SP 300mm f/2.8 LDIF
As I write this, I've grabbed my F3 so I can have it handy as I comment about it.
Appearance and ergonomics:
The F3 has a subtle grace about it that slowly grows on one over time. It is reasonably comfortable to hold with its vestigial right hand grip, its ever so gentle bump on the left side, and its smoothly contoured sides. I have largish hands, so my right hand definitely feels a bit crowded as I hold it. I much prefer larger cameras, such as the old Canon F-1, FTb and Nikon F2. But it's nothing I can't get used to.
The film advance lever is one of the smoothest I've ever encountered. It's just plain fun to dry fire this camera.
The shutter release has a good, tactile feel, although the precise moment of release is a bit hard to determine. I wish Nikon would have given it an AE-Lock function at half-depress, though.
Performance:
The LCD readout basically sucks. I find it hard to believe it's even a Nikon design. Back in 1981 there were already superior LCD readouts in common use that put this one to shame. The F3's looks like a rushed afterthought. And that's all there is, info wise, in the entire viewfinder. Even though I know there's nothing else there, my eye tends to hunt around the viewfinder, looking for more information. I dunno, cuz I haven't used a flash on my F3 in a long time -- is there a separate flash ready light, or does that info appear in the tiny LCD display also? And that cheesy light used to illuminate the LCD display -- why didn't Nikon have the presence of mind to configure it so that it would stay illuminated for a few seconds after releasing that tiny button? Instead, I have to continue pressure on it, watching the light flicker cheesily as I evaluate the exposure information.
In a way, I can forgive Nikon for the crappy LCD display because the Aperture Priority Auto mode is so good. With the F3's very tight 80/20 metering pattern, even when shooting with slides in unusually lit situations, I rarely encountered a problem with exposure. In fact, I became so confident using this mode that, except when I had to use slow speeds to blur car wheels and backgrounds and to blur aircraft propellers, I found myself using it almost exclusively. And even in those situations, the slide film I was using was slow enough that I could just crank the aperture closed such that I would get the shutter speeds I wanted. On a bright sunny day, shooting Kodachrome 64, I was able to shoot at 1/125 @ f/11, which was just about perfect in most motorsports and airshow situations.
Notwithstanding the tedious nature of the LCD display, when shooting in manual mode, the camera is very easy to use. This is mostly due to the ease with which I can spin the shutter speed knob with one finger without having to remove my eye from the viewfinder.
The aforementioned 80/20 metering pattern is, for me, a blessing. I spent years shooting with Canon original F-1s and FTbs, which have partial area metering patterns that behave somewhat the same as the F3's. Knowing the way it meters a scene instilled even greater confidence in the camera, so I could use it without fear of missed exposure.
The MD4 motor drive is such a natural extension of the F3 that I consider it to be a basic requirement. It's good for, what? 5 fps? That's plenty good enough for me, since I rarely shoot in continuous mode. Instead I rely on the MD4 for grabbing "the moment" because it allows me to keep my eye on the viewfinder display. It's the perfect size for my big right hand, so I find it very comfortable to use, and I don't mind the extra heft. There are two other things about the MD4 I appreciate: first, it powers the camera when attached, rendering the camera's onboard batteries redundant. And second, it requires only eight AA batteries. The MD2/MB1 set that powers the F2 takes ten and the battery packs for both old and new F-1 motor drives also take ten.
I can recall, when I was first introduced to the F3 back in about 1983 (a fellow employee had one and showed it to me -- I got to play around with it some then), it was still not widely accepted by pro photographers yet. Many still preferred their mechanical F2s and weren't willing to rely on a battery-dependent camera. I saw this attitude change, however, until by the mid-80s, the F3 had become the default pro camera. It wasn't until the advent of the F4, in fact, that I began to notice pros breaking with the ranks and moving over to Canon because of the EOS 1's superior AF abilities. So, when looking back, I think it's fair to state that the F3 pretty much owned the decade of the 1980s when it came to professional use of cameras. I know from personal experience that, when I was attending auto races and large airshows back then, most of the other pros in attendance were shooting F3s. I scarcely even saw F2s. And on occasion I'd even come across a fellow Canon shooter, which was gratifying since I was still a hard-core Canon FD shooter.
It wasn't until 1989 that I bought my first F3 -- a clean, used example, and my first ever Nikon, in fact -- and at which point my attitude toward camera systems other than Canon began to change. Within the span of a year I had divested myself of all my Canon FD gear and had accumulated a very nice Nikon outfit. Even though it was 100% manual focus, I didn't mind because I knew that AF was an open path, which wasn't the case with Canon FD and which was the main reason why I switched systems to Nikon.
These days, I'm a bit more broadly based. I own SLRs belonging to five different systems (including Canon FD, by the way

) and I own eight Nikon SLRs. I can't honestly say that the F3 is my favorite Nikon, and I certainly can't say that it is the most favorite camera that I own, but it's certainly in the top four or five. Which I think is pretty good company, to be honest, because the top five include both the old and new Canon F-1s, the Nikon F2 and F3, and the Pentax LX. All of which are superb photographic tools. I no longer try to choose a favorite from this group because they're all so good. So in summation, I must state that the Nikon F3 is
not the best 35mm camera ever. As football coach Bum Williams said about Houston's running back, the great Earl Campbell -- "He may not be in a class by himself, but it sure don't take long to call roll." And such is the case with the F3.