Two stage for me on my ARs. I’ve never had an issue transitioning from a single stage trigger on a bolt gun to a two stage on my ARs.
As BSA mentioned make sure a young shooter is aware of the difference and what they are running.
I've never had an issue with transitioning between the two either. The first, heavier stage of a 2ST is nothing like the pull on a SST - there's no "wall" like there is in the pull of a SST or like when you hit the 2nd stage is a 2ST. It's all take-up.
That's about field guns. Smallbore guns with ~8oz triggers are another beast and I'll screw those up no matter which style if I'm not careful!
