I prefer FFX's because I actually enjoyed it on Manual. I know it's not the most popular thing (my girlfriend never played a single match after Luca... /sigh) but I dig it.
But FFX's Blitzball just felt so repetitive, boring and easy after a while. Getting Wakka's overdrives were always the biggest pain for me in a perfect game. More so than the Chocobo Race and Thunder Plain's Lightning Dodge.
If you haven't already, you should play the PAL version of FFX or the FFX International version. Fighting Penance and the Dark Aeons adds a whole new dimension to the game. I don't know why the N.A Version removed this feature. Penance and Dark Aeons too hard? They should try Demi-God from SMT: DDS, then they will know whats hard/
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Rock n' Roll and Glam Metal... It never died