I grew up using pumps, Ithaca 37 and Rem 870. About 20 years ago I bought my first semi, a Rem 1100, after that a Benelli SBE and have never even considered a pump again.
Get the semi, it's no more liable to jam than a pump is and you can't short shuck it. Actually I can't remember either of mine ever jamming, but I can remember a few short shucks and once got a snickers wrapper jammed in the 870 action and like to never got it cleared.
Only benefit I can see to a pump is they're generally less expensive to buy.
Ecxplaining the wrapper jam. I was dove shooting and reached in my coat pocket for a couple shells. There was an old Snickers miniature wrapper in there that I didn't notice. I shoved it in the 870 along with the shells, first time I shucked it she jammed up tight in the action. Felt like a fool.