Welcome, Waterfowling is fun and a great way to empty your wallet.

The three guns you mentioned are all good guns and will serve you well if you take care of them. Go to your local gun shop and ask to look at each model. Shoulder them, work the actions and you'll find the one that feels just right for you. Before you know it the wallet will be lighter.

I own several guns in both Mossbergs and Remingtons. My goto gun has been a 12ga. 870mag but the last half of this season I used a 20ga. 870 Express because I have an abundance of Heavyshot in 20. The geese didn't know the difference.