I like doubles once I learned how to shoot them. Believe there is a differance but so easy to correct. I have a 20 ga double has two chokes on it mod and full but if ya ask me its full and fuller. Its a browning and I take it bird hunting or have during the times I have been invited to go. even with the cheapie wal mart 20's I still bring in my birds that the 12's do.
I know I only have 2 shots and I have to pick my shots also. I have a pump next to the bed for self defense, Its and Ithaca, tried and true no need toreplace her. The previous owner either cut the barrel to 20 inchs or had someone do it. Either wqay they did a great job, just a shame had to be a nice hunting shotgun. But it has a good home wqith me. I have another one that is not in as good a shape but it has a full choke tube.
The mod choke was or has been the most popular, but I like the full choke better myself. Much more versatile, for my money.