Very interesting thread. Lots of good arguments for/against both pump and semi. For me, my go-to shotgun is my Benelli Nova Pump. I don't consider a pump to be advantageous over semi, but I do like the size of the shotgun for tight spaces. It's compact, points well, and was "relatively" inexpensive. I would have no qualms about getting a semi in place instead of the pump, but for now, my Benelli is "on watch" 24/7.
To be perfectly honest, the shotgun I would prefer over any of these for compactness and quick deployment in home defense is a 12ga coach gun. They're so compact and light and easy to snatch up quickly that they're ideal for HD (IMHO). No need to pump and no worry about a bad semi feed, but if you can't take the dudes down with two shots, you'd better reload fast. That is a drawback, of course, but for most HD scenarios when adrenaline is running high, small and compact shotguns with dirt-simple manual of arms are ideal.