If we're talking Otomate, i'd say hakuouki ought to be my fave out of all of them. I'm a plot freak, and while it was a bit tedious to go over and over again through the same text while going through different routes or trying to get different endings, I guess it was still somewhat satisfying when reaching a good ending (Hijikata's true end actually had me in tears ;-; ). I'm really excited for the new hakuouki title that's coming out this year, if i'm not mistaken (eVEN THOUGH I'M ALSO ONE OF THE UNLUCKY ONES THAT GOT NO VITA). I've never actually finished Amnesia since it didn't feel all that interesting to me, though the fact that I watched the anime first and otome-adaptations tend to be not so good, it might've influenced my thoughts.
I hear Collar x Malice is also a good one, though I haven't properly read reviews yet :0c but yeah, basically, for now I say Hakuouki is the Otomate game that won over my heart atm. There's also Sweet Fuse tbh, though for some reason I always felt second-hand embarrassment when going through the game, I really don't know why.