OK, Back to the bit people.
I don't believe the American TT's are inherently bad. Many, many horses ride in them just fine every day. There is just the potential for miss-communication with them in my opinion. There are other bits (Like the one the Iride posted) that I prefer, however my horses liked their TT...and it has been a "go to" bit for many years.
In the end I prefer to use the mildest bit with the best communication possible for your particular discipline.
Be strong and courageous, and do the work. Don't be afraid or discouraged by the size of the task, for the Lord God, my God, is with you. He will not fail you or forsake you.
1 Chronicles 28:20