I don't wear my rings too much, but I have hall all types. For me, width is more important than the material. I have worn thin metal & silicone, but they cut down into my skin too much. Wider rings don't do that to me.
I like my metal rings the best. One is a little larger which I use during sex; the other I wear under my clothes when I don't expect to get a large erection. Properly fit, they feel the best for me. They can be difficult to take off when you have a chubby or are erect.
I quite wearing my leather one with the snaps. Sometimes I would pinch myself while snapping and the end of the leather under the straps wears down into my skin.
My favorite lately is made from neaprine. It is wide, flexible, doesn't cut into my skin, and is easy to take off when erect.