Seldane, whats different about the PSX version of the X68000 game or is it just the psx controller you don't like? I'm playing through that one now original mode) and it seems exactly like the emulated version I have (but I've never played it on real x68000 hardware obviously). I've read that there are some super minor changes like sound effects or something? I agree though, that game completely rules, but it's so damned hard. Definitely the hardest Castevania game I've ever played. The music isn't very good though, I don't know what's up with that, even with the original FM sound it just isn't that great compared to other Castlevanias.
My vote was a toss up between Super Castlevania IV and Bloodlines, but I went with Bloodlines since it's fresher in my memory having just beaten it a few weeks ago. Rondo of Blood is great, but its WAY too damned easy for a traditional Castlevania game.