I've got two mossbergs a 590 and a 930Spx. Only downside of the 930 is you can lose the charging handle fairly easily if you bang it around.
I've also got two side by side. One is a cz ringneck in 12ga the other is a cz hammer coach double hammer double trigger.
I've owned other models including benelli winchester and browning.
Do it all, just one, I would pick the mossberg 500. Due simply to the amazing amount of ways it can be configured from black powder to shotshells of all sorts using a massive ammount of barrel options.
If I had to leave all but one of mine I would take the 590 simply because of its rugged simplicity. The damn thing just works with no real negatives. I've used it for trap shoots and do pretty well with it much to the dismay of the o/u crowd getting owned by a shorty pump gun...
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent