I have been shooting both types of cameras for several years. The main reason I shoot both systems is because Nikon and Canon each have some lenses which are unique to each brand. For the Nikon, I like the old 2.1cm Nikkor, along with the 28/2.8 AIS, and the superb 105/2.5. For the Canon, I love the old 35/2 concave, and enjoy the 50/1.2L, and the 85/1.2L.
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Here are a couple of my old cameras. They have both seen a lot of use, but these are actually a little cleaner than some of my other ones.
The F2 is an old "no name" titanium model made in 1979. It saw a lot of professional use in the north Pacific area in Asia, and despite ice, snow, and salt water spray, it continues to motor on.
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The F1N had been used for sports shooting, mainly high school baseball and soccer games. Here in Japan the Canon FD bodies were not so frequently used by professionals compared to Nikon, but they were a top choice of serious amateurs, and Canon has a long history and great reputation in the Japanese domestic market.
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It is rather hard for me to choose between the two cameras. The Canon features AE, but that is something which I seldom use. For the sake of it, I switched this camera to AE mode, and was quite surprised to find that it still works. The one drawback in the F1N is the electronic shutter. I have had to switch to my Nikon when the battery died in the Canon.
I have tried other cameras, such as the Minolta X1 (known outside Japan as the XK). I found the Minolta to be the most finicky and unreliable "professional" SLR which I have ever used. I have two which serve as bookends on my book shelf. Too bad they weren't made as well as the SR series.
Another also-was is the Pentax LX. But the selection of lenses was too limited for my taste, and I prefer the control layout on the Nikon and Canon bodies. I prefer the older Pentax K or AP for their smooth operation, and to use M42 lenses.
If I had to choose one over the other, I would go with the Nikon, mainly for it's mechanical shutter, and easy maintenance. None of my Nikons have ever required serious maintenance, except an old Vietnam war F which had sluggish slow speeds. But I have taken apart and put back together some junk shop F and F2 cameras, and found them quite easy to work on. The Canon F1N is not as easy to get into.