Physically, I think the original F was the top. No fuss, no frills, but everything you wanted plus interchangable finders and screens. Ergonomically, the F2, where the layout is more natural to my hands, and the back doesn't have to be removed to load film. I acquired one after my F collapsed just before a trip a few years back, and while I love the feel of the F2, like others of its breed, it's a bit of a hypochondriac. OTOH, it hasn't needed service since originally purchased (three trips to get the shutter release to reliably fire, and not just in level, horizontal, mode), so maybe it was just adjusting poorly to a new camera bag.