I have both - the dimensions and padding are similar enough to give me the consistency I wanted across bikes. Ti /leather goes on the road bike, Chromoly/vinyl goes on the commuter that is regularly exposed to rain/snow/junk both on the ride and on the front of the bus. Not a fan of gel myself -- squishes out from where I need to and then puts pressure where I don't want it. I love the Ti/leather - subtle patterning allows me to stay put when I want but shift effortlessly when I need to.