I think both are equally "manly". It's a lot harder to be your own power for sure, but you do face other risks that can be more life threatening on a motorcycle than you would a bicycle, depending on where you are riding. I personally enjoy both. I like the fact that you can cruise on a motorcycle and just enjoy the outdoors and do very little work except monitor the road. I also like the fact that you can physically feel a sense of accomplishment with cycling. You see more beer bellies on a motorcycle than you do a bicycle