Kershaw has some nice products, really nice stuff like the Nakamura, and the Ken Onion designed Splinter, the cocobolo version I have is really pretty and a great knife, AUS8 steel. Most of Kershaws knives have 420 and 440a steels, which is fine for the casual user, but for hardcore bladers, you would need better. Kens higher end designs are pretty good.
Benchmade, while much more expensive, has a lot of custom collaborations, and uses higher end steels. I have an Apparition with 154cm steel, which is more than I need, but I like it. I also have an Outbounder, River Rescue and 551 Griptilian, all in 440C, not the best steel, but all around one of the best and most common steels, and highly lauded. I also have an old Nimravus Cub, with ATS34 steel. Even Benchmades red class are a good series of knives.
My vote is for Benchmade.