Currently, I own Remington, Savage, IGA, Mossberg, Browning, Simonov, lithgow enfield, and a spanish 1916 as far as brands go, and to be honest, there isn't a whole hell of a lot of difference to me. Granted, the guns I have all seem to be good shooters, and i have never experienced any problems with any of them.
Now, in every batch of guns from every manufacturer there will be a few lemons, and sometimes, there are a high number of these, but in a perfect world, they should all function perfectly and as intended. This is where warranty service and replacement come in. Like I said, though, I've never had any problems with anything.
For me it comes down to suiting a gun to its purpose. If i want a new pump shotgun, but don't like the looks of the Browning, but the Mossberg will do the job and feels better to shoot, then that's the one I'll buy.