Which is the better bike? Which one is happier operating between 65 and 75 mph for sustained periods. I like the full faring on the Suzuki, but right off the bat I see that the Ninja is lighter with a slightly bigger engine, and is liquid cooled. Don't know if liquid cooling is all that important on a bike, but sounds good. Sorry, but all the answers you all are giving me, as great as they are, are creating more questions. I do feel that I am heading in the right direction though. Was never comfortable with the idea of starting on the Katana 600. I am going to post this same topic/question on the Suzuki forum as well just to see how different the responses are.