TTYD FTW!!!!!!!!!!! They have better characters, partners can do more in battle,better partners, More storyline and a lot more adventures. Plus this time you can do stuff after you beat the game.
I like SPM the best, because, ive had the first since i was 4 and the second since like 10, and I always got mad that you could NOT under any circumstances dodge obliteratingly strong attacks.
I still havent beat Kent C Koopa and the first one, and im lvl 100 xD