personally I like the r7's better.......better to look down at and a little better feel off the clubface......I really don't like the hosel on the x20's but the tour model I like with the long hosel and the project x shafts.
I can't vouch for the R7's (but they get great reviews), a friend of mine that plays in my weekly 4 just bought 20's and he's killing them. He tried everything under the sun, as he has no manufacturer loyalty whatsoever, and these knocked his socks off. He's picked up a full club in length and hits a prefect draw everytime, from 3 iron on down.