I don't understand the pejorative implications some folks imply when mentioning a Rolleicord. Most of my best images have been make with a Rolleicord. Some of my worst images have been made with Hasselblad.
I agree with you. But on the internet there can be many "tribes" of photographers. A lot of people who own a Rolleiflex (or a Canon, or a Nikon, or a Yashica TLR etc.) think that everyone should belong to their tribe (if they don't want to be, it raises the—scary, for them—proposition that maybe they're in the wrong "tribe").
You see this in action all the time. A newby does a little research. Decides a medium format SLR will suit their imaging needs. Interchangeable lenses, magazine backs. That sort of thing. But perhaps they're not sure which one to get. Hassy or Bronica? 6x6 or 6x7? So they ask for advice. Along come three or four people telling them they should really get a TLR, instead. And guess what? Yes, they are all TLR owners. Maybe Rollei owners. I see this all the time online in forums, and, frankly, it annoys the shit out of me.
So it's a bit of a dirty little secret. A lot of owners who have lashed out on a Rolleiflex (especially, it would seem, those well-heeled types who have ponied up for a 2.8F "White Face" in mint condition, because we all know that white paint will give you better images) have so much invested in their choice of kit, emotionally, that they are unwilling to consider the possibility that a Rolleicord costing a fraction of the price is capable of making images that, in most instances, are very hard to pick from those made with an 80mm Planar. It's very much the same sort of thought process, I suspect, that occurs when so many owners, or would-be owners, seek out a Planar lens instead of a Xenotar, when the facts suggest there is so little practical difference between them, that sample variation is the determinative factor in performance differences. The short version is they seem to have an ongoing need to justify their choice of camera and/or to be reassured about it.
None of these people are going to tell a prospective purchaser that they could be really happy with a Rolleicord, which is a fabulous camera in its own right. Even if it's a better choice for someone's budget, or their neck, or perhaps, ergonomically (right side focus for earlier Cords v left etc.) They just don't see past the idea that other photographers should be in their tribe, which is potentially unhelpful—at best.
It's appropriate to disclose that I own three or four Rolleicords, two 2.8 Rolleiflexes and a Tele. My comments above aren't those of a disgruntled Rolleicord owner who couldn't afford the Rolleiflex of their choice. I can't afford a Wide, and I'd love an Art Deco Rolleicord one day, and perhaps an Automat, but, I've got my prime desires in the Rollei line up, and am very happy about that. I think they are all fabulous cameras that are more capable than their owner. But I wouldn't, in good faith, tell a prospective buyer to get a Rolleicord (or a Rolleiflex) when they really would be better served with, say, a Hasselblad, instead, because I don't feel a need to convert others to my own preferences—rather, to offer some suggestions relevant to them, not to me.
Getting back to the question posed, initially, Ie.
I used to use a rolleicord back in the old days,then I grew up.Now I use a Hasselblad for 6x6 negatives.I've been looking at sold Rolleiflexes on ebay and there is a bewildering variety of models and prices on sold cameras.A simple question to the users out there,what serial number/lens etc do you prefer/recommend and why?
It's all about condition. These cameras are all getting older, like us. Some of them have been cherished and treated lovingly, others have been thrashed, trashed and abused. You just can't say that, Eg. an E or F model will always be a better choice than an Automat or a Rolleicord because it depends on their condition. They last a very long time, indeed, but even a Rollei can wear out if it has been used professionally for decades. And they weren't always owned by people who appreciated just what it was they had obtained. Condition, condition, condition.
There are some basic things that should inform your investigations for a Rollei. Do you prefer to focus with your left hand or right hand? Up to the Rolleicord V the focus and film wind was on the right side. From the Va it went to the left like the Rolleiflexes.
Do you prefer a 75mm field of view or 80mm? Personally I think this is more important that the 2.8 v 3.5 issue. For portraiture the 80mm is a great choice. For general imaging including some landscape, the 75mm is useful. Naturally you can do any sort of imaging with either focal length. But still, food for thought.
How important is weight? I have a shocking neck so I pay for it when I lug a camera or two around for a few hours. It doesn't stop me using my 2.8 but 3.5 Rolleiflexes and Rolleicords are both lighter, in some cases quite noticeably.
Do you need the option of fitting a prism? Most models of Rolleicord or Rolleiflex cannot accept them. The Rolleiflex E2-->F, T, and Rolleicord Vb being the main types that have the option. I am of the school that feels a TLR handles and works best with a waist level finder so (apart from the Tele) my own preferences are for the older models. I think the earlier types look better without the meters. But this last is a personal thing, not a black and white factual consideration. Plenty disagree with me there.
Budget is another unavoidable point. You can get a better example of a Rolleicord for any given budget than you will for, say, a 2.8. If funds are tight ask yourself if you really need that Planar lens, 2.8 instead of 3.5, or even a Flex at all when a Rolleicord is a great camera in its own right.
How big do you print? Do you shoot wide open often? The famed Xenotars and Planars really come into their own when used wide open. This is when their superior edge and corner definition begin to make a palpable difference. If you don't have a need to make largish prints that were shot with a wide open lens you will struggle to see a lot of benefit from choosing a late Flex instead of a Cord, which performs well at all apertures but is stunningly sharp from f/5.6 if you have a good example (and most are, or, were, when they were new so they are out there).
There are other things worth considering but these are some of the main points of differentiation between the various types. Apart from the Rolleimagic models Rollei never made a really bad TLR, and even the pre Automat types from the early 1930s (or earlier) have made images of surprising sharpness and quality. It is all relative. Think about your needs and find the best example in the best condition that meets your budget.
Cheers
Brett