However I do believe some bits are useless in training such as kimberwicks because they only serve to make a horse stiff through its jaw. I personally don't like riding young horses in loose rings because they need something more stable so they can learn to reach towards the bit.
My horse was started in a kimberwicke and when I got a loose ring, she was a little better, but not really. It was like she had no idea what to do. I got the loose ring because I believe she is above the bit and when I talked to the person at a tack store, she suggested a slow twist loose ring. That's the loose ring I have and personally I don't like it at all. I feel it is way to harsh for her. And I guess that's why I only rode her for about 5 min. With it, then got off and just played around with her.
I know any bit is made harsh/mild by the riders hands, but I feel some bits are more prone to being harsher than others. I'm hoping she adjusts well to her new bit, and I'm going to make sure she accepts it before I get on her back and start doing stuff. T
Thanks for everyone's input!!