I always liked Mace Windu's saber, i wish Jedi had more unique saber colors, there was never any OT lore to state sith = red & jedi = blue/green, that's something the EU assumed & Lucas followed with the Prequels.
I like Kylo's, the vents are silly if you think too hard about it but you shouldn't because it's Star Wars and I like the visual motif of it being a classic broadsword. Dooku's has the coolest handle I think.
I really like Luke's ROTJ green, though. With his all-black outfit it's very striking.
The prequel sabers look too clean and machined, like they've been designed using CAD. The OT sabers look like they were bolted together using whatever junk was lying around, which makes them feel more personal and unique.
Darth Maul's saber is a pretty iconic design from the prequels though.