Wow, no love for the X-Men Anime.

I liked them all for different reasons. I don't have a favorite series wise, but I remember seeing the X-Men guest staring on Spider-Man and His Amazing Friends when I was a kid and wanted to see the X-Men on the screen since. Of all the animated versions of the X-Men, the weakest was definitely Pryde of the X-Men (tho' I bought that on VHS when it first came out). XtAS was good for its time for adapting so many storylines, but the animation would tank sometimes (understandable considering how detailed the characters were - Rogue's hair especially) and while I liked Jean, hearing Scott always calling her name kind of got on my nerves. Evo and WatX I felt were interesting as the weren't so faithful to the source material for stories, but some episodes were meh in both series. Anime X-men's story was... ok-ish, but the animation at times was on point (Captain Britain was Madhouse buff).

If I had to pick one it would be XtAS Japanese version for the killer intro!