Personally I like the Mossberg 500 but when you butt up weapon to weapon, both are excellent and dependable shotguns. These two are probably the most famous and the most owned shotguns out there. They are both affordable, you can find them at almost any sporting goods store, mega mart and gun shop out there. Both Mossberg and Remingtion make different varieties of the individual shotgun.
Here is the same model but it has been totally made into a tactical weapon