I've been very active in dove hunt for many years, I prefer an 870 in either 12 or 20.
I've also done a good deal of O/U wing shooting, but I like that triple option of a pump.
I've also hunted dove with A5's, 1100's, 1187's and a couple other AL's. But it seemed like I missed more birds, I also used up a lot more ammo due to taking premature follow up shots.
I also had an opportunity to shoot an 870 in .410 (3" reloads) a few years ago, it was a ton of fun, I absolutely loved it. My buddy made a bet with me as to who would limit out first, that was an easy $20 in my pocket. But unless you have a good deal of experience wing shooting, a .410 probably wouldn't be the best choice. It can also be more expensive to shoot, especially if you don't reload.
Out here in SW Arizona limiting out can be accomplished in minutes by a seasoned dove hunter. But now with the Eurasians here in strong numbers, dove hunting can be enjoyed all year long, and there is no limit on them.
GS