Here's a good one:
http://www.ar-15.co/forums/showthrea...highlight=1300
As far as popularity goes, I'm in the minority, but I like the Win 1300 Defenders. Rem 870's and then Mossy 500's are more popular. I carried an 870 for years on the job, and it's solid. I prefer the Defender. Its Speedfeed system is much faster and smoother (for me) than either of the others, and I've shot lots of them all. If pulling / exerting a rearward pressure on the fore end when you fire, the remmy will require that you release rearward pull and push forward on the slide momentarily before you can then again pull rearward to rack the action. The Defender will immediately allow the fore end to slide back, and if you're already exerting rearward pressure, it just seems to rack itself. Very fast. Granted, I believe the Mossy has the best safety placement.
Now, if someone reading this works for Remington or Mossberg, don't get all pissy like the guy from Olympic did, this is just my opinion, after a bunch of beer.
If you live near me, I'll let you try out the action on all three, decide for yourself.