Having had all three (F, F2, F3hp) and used all of them for both pro and personal work over a period of almost 40 years , I’d have to say the F3 proved my favorite and the most reliable. I had and used it the longest. The F2 never appealed to me as much as the F either, for reasons that I can’t really divine.
But they are all good, solid cameras and not tanks like the F4 and F5. Of course, an F3 is 4 decades old now and is an early electronics beast: it’s the most likely to be unrepairable now as a consequence of that. But the F3 was also in production the longest, they finally made the last few of them in the early ‘00s see it’s more likely you can find a near new, Undamaged F3 than either of the others.
My current, final F was a wreck when I got it. And took a serious overhaul to make it nice again. If you like the camera a lot, it’s worth the effort in the use you get out of it afterwards.
G