I agree the Rivcos are definitely better looking but from everything I have heard if you drop the bike with them extended you will be buying a valve cover. I ride with the Kuryakins and I find them very comfortable. I have a good friend with the Rivcos and he loves them so I guess its whatever works for you personally. I have noticed my friend is very careful to fold his Rivcos in whenever he doesn't have his feet on them which seems to be a lot of trouble to keep reaching down and folding them in and out. I do think the position of your feet position would be more comfortable with the Kuryakins if you are tall because they do put your feet farther forward.

Just my opinion