You answered your own question Eeksplee:
The Beretta feels a bit more 'proper' in my hands.
A few years ago I was in the market for a new shotgun and I fell in love with everything I was reading about the Xtrema. Problem was when I finally handled one it did not feel "proper" in my hands. I waited and picked up a Maxus last year and love it. A good friend purchased the Xtrema and he loves it. We have switched guns while duck hunting and I have to say I'm pleased with my choice, as is my friend about his Xtrema.
When it comes to shotguns always pick the gun that feels/shoulders the best.