OT Yoda, of course. As far as I'm concerned, without the magic of Frank Oz's hands and voice, it's not the same-- no matter how "good" the CGI technology looked by the time Ep. III rolled around. Other than "just because", there was absolutely no point to have a shitty CGI Yoda in the majority of the prequels. For far away shots and obviously the "action" scenes, yes. But in CU and for overall performance, to shun the puppet was downright disrespectful to the character that Oz helped to create, and to Oz himself.

Plus, Oz's prequel Yoda voice just sounds weird, too. In the AOTC behind the scenes stuff, it sounds like he's not up to snuff in most of the line-readings that Lucas just says, "That was great" for. It seems like he came in for like an hour and burned through it all. Then again, Lucas can't tell a good performance from wood, hence Natalie Portman's acting.

Watching Empire now, after seeing the computer Yoda, the character is even more of a marvel. The emotion conveyed by just a puppet and a voice is amazing. You really forget he's a puppet sometimes. Whereas, I always was thinking about the effect in the prequels. It's a shame that with so much reliance on CG sets and characters, that Yoda couldn't have remained one of the "real" things.

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I dont like the fact that epII and III yoda flies around with a lightsaber.

I agree. Yeah, he was "younger", and I really do like the idea of Yoda kicking ass, but he does fly too much, and too fast. Back to the AOTC making-of stuff, Lucas seemed to want it faster and faster (and more intense! LOL)-- making it more ridiculous. You can't show Yoda hobbling around the prequels (even being CARRIED, and RIDING on a floating device), and then have him flying and swooping-- it's just dumb. There could've been more of a balance between the docile Yoda, and Ninja Yoda.