I believe my horse's first bit was some sort of loose ring. He had no respect for it. As soon as he got an eggbutt, he was a respectable mount. I think it may have been due to rough hands and pinching because he did have some marks around his lips that weren't natural. Then again he had a lot of marks on him- period.
I was thinking of getting him a Dee ring, but that might encourage him to grab further so I think for my horse, if I had to choose.. I'd say loose ring because it helps that I have quiet hands, and I have a flash noseband to help stabilize it if need be, but if it was still pinching, I'd grab a pair of bit guards.
However, if I were to use a Dee ring with something like an oval link bit or a french link bit, then he probably wouldn't grab and go. That's the bit I want to try on him: Dee ring oval link bit. But till then, he works pretty nicely in his eggbutt.
Personally, I rather see a horse in a bit that can't cause them any kind of pain. I'd be put off if I got pinched on my lips for no real reason or have the bit being pulled through my mouth. Bleh!
"Strength is the ability to use a muscle without tension"