I like them all for different reasons, though I haven't played Peach Beach Splash yet. (I'm covering that on my site over the summer!) If I had to pick a favourite, I think I'd actually go with Deep Crimson. I enjoy the 2.5D brawling action and big boss fights, and I'm a little sad the upcoming Burst remake is switching to the 3D arena-based fighting -- this isn't to say I dislike that style of gameplay, but as someone who grew up with Streets of Rage and suchlike, I always had a soft spot for 2.5D brawling!