RE: 20 or 12 guage?
i have a mossberg 500 20 ga and a mossbers 535 12 ga, and i like the 12 for everything EXCEPT deer, the 20 isEXTREMELY more accurate and with lightfield slugs, its the 2nd best deer gun ive ever owned (behind a traditions .54 cal muzzleloader)
-but really, it all depends on what youre hunting for