I haven't been hearing good things about the Maxus but I've rarely heard anything bad about the SBEII. You might check out Shotgun World
as they have forums for Benelli and Browning that you could probably learn a bit more about each of those guns.
And not to throw in another choice but I really love my Beretta Xtrema2. Great auto-loader and tough to beat when you have the Kick Off system on it.