It depends on the fenders.
If you are talking something like Poison Spyder where they really taper at the front, then a stubby will look best.
If you are talking full width like stock, just flat, then a full width can work.
Then there are some that are in between, like MetalCloak Overlanders. I was leaning towards these and think they would still work with my 10a bumper in full width mode, but the end caps are removal, turning it into a stubby if I feel the full width isn't working.
I think stubby bumpers look cool, but there is something about a DD that makes me want to have more bumper up front to protect the axle during any kind of mild collision. So i'm with you... keeping mid-full length.