So basically the question is, which design for the beast races did you prefer and for which reason?
I specially ask for the reason because a lot of people say "because they could wear boots/full helmets now" when they couldn't in Morrowind. However the point there is this could have VERY well been done with the more animal like version as well and in fact HAS been by modders.
Plus the helmet issue has never really been fully resolved anyway as they still just replace the head (while they do stretch a bit it's not enough to actually fit).
However I can still understand people preferring the ones from Oblivion too though I don't really want to it be from the wrong reasons.
My personal choice are the ones from Morrowind, I'd love to see those again, with better animations and more design options of course. Simply a bit more effort put into them, the same effort you'd expect from anything in the game really.
Though one of the choices is also "OTHER" design which would also go close in my decision since the Morrowind design could still use some improvements.
PS: I actually think they where so under-done in Morrowind because they where actually added pretty much as an afterthought after fans complained that they where supposed to be NPC only.
PPS: I know there also was ONE Argonian in Redguard, not sure if Khajiit where in there soemwhere and what they looked like so I didn't include those.