I had the Pedersoli 12 Gauge that came with a full set of choke tubes. While I see the majority here do not favor a choke of any kind due to wad loading issues, I did not have any problems, even with the turkey choke, because I don't use the big fibre wads. I like the 1/8" felt wads (you can stack if more thickness is needed) which you can get into any choke easily. I just had a .58 caliber jag on the end of my loading rod instead of a 20 GA jag and all worked well for me. :idunno: I'm not a big shotgunner, though, so maybe I just put up with more for the very limited use the gun saw.
If you really want to also shoot ball, be conscious of the size of lead ball you'll need for a 12 Ga! If I wanted to do "everything" you mentioned in one gun, I'd personally opt for the 20.
The long-term problem I had with mine is that it just did not have enough drop at the comb for me and I always struggled to bring it up quickly and have it on point. Hence the reason I no longer have it. Until a recent post in the Hunting Section by Britsmoothy, I didn't realize that the older versions of those guns had more drop, but then they changed the architecture, probably to save on wood since a straighter stock will allow more stocks per plank.