Like BSMS said, I reserve the one ear headstalls for my broke horses that are in a curb bit. And my snaffle bits always go on a browbrand headstall.
If I was barrel racing, like Beau, I would use browband headstalls especially on gag type bits. The browband headstall offers a little bit more stability in those situations in my opinion. I have seen girls go to pull back on both reins causing slack in the headstall and the ear loop pops up over the ear.
I even have preferences on the different types of one ears, I prefer the split ear compared to the sliding one ear for work. I have both types and a lot of the show one ears are the sliding one ear(actually the sliding double ears are popular now). I ride in the brush and the thick willows along the river and I have never had a split ear headstall come off.(hopefully I didn't just jinx myself..LOL) I also don't allow my horses to rub on me or anything else while their bridles are on so I don't worry about them rubbing them off either.
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.
PLAYBOYS OKIE CODY "HOOEY" 10/21/2019