I’m sure it varies quite a bit but are kids using 12s or 20s more? pump, double barrel or semi auto? are there more 870s out there or specific trap guns?
Autoloaders are far and away the most common for the kids at our school. Pump guns are rare, maybe a couple of kids out of 60. Next most common are the kids shooting sporting clays style o/u guns. More of these than pump guns. Then there are the dedicated trap guns, which are more common than I’d have thought and there are more kids shooting these than pump guns as well.
12 gauges are by far the most common, but among the middle school kids it’s a 50-50 split of 12 and 20 gauges.
Personally, I bought my son a gas-operated 20 gauge auto youth gun because of the fit and the recoil reduction. I was concerned that if the gun beat him up too much when he started it would sour him on the whole deal, so better to start off easy with light recoil and then we’ll move him up fron there. The most important thing to me is that he has fun and wants to shoot more.