Hands-down IMO the Remington 870. I have two of them. One I have had for 12 or so years and a new one for turkey only, 870 3.5" SP-T.
With both guns I have had no problems. The 870 Express that I have had for 12 years has never jammed. I have killed rabbits, squirels, doves, deer, fox, turkey, crows, and paper targets. All purpose, never let you down, IMO. In my 870 3.5" I have not had a 3.5 shell jam.