I really like both and I think Yu-Gi-Oh! is one anime that has "true" antagonists..many of them aren't bad at all they chose their path for a reason look no further then the members of Doma (including Dartz-sama,Amelda,Raferu,Valon even Mai-chan had a reason) well Dark Marik was created by Normal Marik's Hatred for his father making him be a tomb keeper and wait for the Anonymous Pharaoh and Kogoro/Lector's accent in the dub is just a win..the Big 5 also count as antagonists by the way. But My All time Favorite Yu-Gi-Oh! character is Jono-kun/Joey so that breaks the tie for me :p

I do like the antagonists on this show, but then again, I also really like Joey, Yugi, Yami, Tristan, Tea, Duke, Mai, Serenity, ect. And what can I say, I like the good guys.

Wow that's a hard one, my top 3 characters are Dartz, Kaiba and Joey but I think if I were to do a top 10 then most of the characters in it would be antagonists so I'll go with them since I tended to like all of the main antagonists in Yu-Gi-Oh! anyway but its very close.

thats hard cues i love marik and bakura and all them but i love yugi and duck and joey and all the good one ryo and good marik and seto and all the good ones but love the bad ones as well

By Far!

Good Guys all the way

The villains. Especially Yami and his past self as the Thief King. Not surprising.