I wouldn't purchase a semi-auto chambered for 3.5" shells with the expectation that it would be my #1 gun on the dove or trap/skeet field - or in other words, if I was going to shoot a lot of 2 3/4" shells through it. I've shot 1100's, 11-87's, Super Black Eagle I's and II's, Browning Golds, and my favorite - the Winchester SuperX2. All function well if they're kept clean. No doubt that a semi-auto requires a bit more diligence in the maintenance dept. than a pump. I know some heavy-duty waterfowlers and turkey hunters might like those hard-hitting 3.5" shells, but in my experience, if you're good with a shotgun, a 3" shell ought to bring it down! LOL
Buying a 3" semi-auto loader just gives you more flexibility for all loads and all shotgun shooting scenarios, in my opinion.
Do some research on load patterning in 3' vs. 3.5" guns. Those large-chambered shotguns typically perform better the larger the shell you're shooting. (Something to bear in mind if most of your shells fired are only 2 3/4's.)
Good luck! Always fun researching and then purchasing a new shotgun!