The vast majority of turkey and waterfowl hunters use repeaters in the states and that's likely to not change anytime soon. For people that hunt in the uplands I imagine what is chosen is based more on budget than anything else. I know more people that shoot doubles or O/Us than repeaters and I think on most internet forums you will see a similar trend. Since WWII we Americans have wanted more. We wanted guns that held more cartridges, and we wanted cartridges that held more shot. That's why for the most part repeaters are hell for stout and swing like a 2x4. They had to first handle 3" cartridges and now 3 1/2". Except for people shooting steel shot that trend has switched somewhat. There is a renewed interest in double guns including pre-WWII American, British, and European guns and more new doubles and O/Us are available now than ever before. Trends swing back and forth and right now it is swinging away from pumps and autos in the U.S.