It's really hard to just recommend a MTB hub, as it could be used for anything from XC to downhill racing.
Also, do you need just a QR hub, X-12 or what it's called or a through axle?
For the front, I couldn't tell if they're better or not since I don't know the project 321 hubs, but the Tune Cannonball and Cannonball SL lefty hubs are both very nice and lighter. If you want matching hubs, that's probably what I'd do.
"Nothing compares to the simple pleasures of a bike ride," said John F. Kennedy, a man who had the pleasure of Marilyn Monroe.