Not that Dypsis is my favourite palm genus, but my biggest is madagascariensis (var. lucubensis) which is pretty ordinary. Got a lot of lutescens (a few varieties) full size, which are okay. A small rivularis which is still a bit ordinary. A small leptocheilos which is still too small to be notable yet. But my favourite would have been pinnatifrons, may it rest in peace.
Wow, that is an impossible question to answer... not too many Dypsis grow that well for me so I can't say I have much personal experience with any, other than watching them die. But after visiting Hawaii a few times, I sure can say there are many dozens of them that are really nice.
I like Dypsis decipiens because it is a nice looking palm, but it also one of the few that do remarkably well in southern California (once they finally get going).
I have two trunking Dypsis plumosa. They look like a messier form of the regular Dypsis onilahensis.
I love the weeping onilahensis, unfortunately my tiny one croaked in the ground. I seen nice looking D. pembana and D. lanceolata - these may be next on my dypsis wish list.