Originally Posted by kaydeebug
i use a twisted snaffle on a black reining horse I got... he does great with it doesnt fight it or anything but im borrowing him and the lady told me to use an o ring so that is just a training bit. and I have no stop with a ring
That tells us everything we need to know right there. Yes, a snaffle is primarily a training bit. That is why, if your horse has a training issue, then they should be in a snaffle.
The problem with a TT is simply mechanical. I could ride in one and get my horses to do exactly what I wanted, however, I can do that in anything. However, they are mechanically confusing as all get out when you pick up on one rein for a correction, plus they are much harsher than needed simply because of the combination of curb pressure and the nutcracker action. An educated person can do well in one but their sale is directed toward uneducated people. Why? Because they are uneducated about the mechanics of how they work and thus think "well, it is a snaffle bit so it has to be good". It may be the most widely used bit for western riding, but that is simply because it is also one of the cheapest to buy and unfortunately, many western riders are simply self taught backyard riders who do not understand the finer points of properly bitting a horse.