Zombie thread as they say but Google puts this at the top of Selle SMP: Evolution vs. Composit searches so it is still and will remain relevant.

I did not know the difference between the two. Thanks to Google and this thread I now know that Evolution is more padded than the leather only (I presume) Composit. Thank you.

In answer to the OP... I have had no experience with Composit, but I have used Evolution and Carbon which is without padding and without leather.

I used cheap Chinese fake selle SMP carbon which were okay but I think that they encouraged me to be out of the saddle more often, and I am not sure if this was good for my, now failing, knees. I am 55.

If I were younger I would recommend padding-less carbon saddles. The padding in your shorts is sufficient. The hole in the middle is the important thing. If you are not supporting yourself by your soft tissue (your perineum, or worse in ladies) then you do not need padding.

However, the good thing about carbon saddles is that you slip along them. That means that forward aft vibrations are not a problem.