I like to ride with somebody or in a small group. And if I know them beforehand, it's easier to "ride my ride" and not to worry about the others doing something stupid.
Though I have to admit that going by myself gives me a different kind of freedom to go where I want and as fast (/slow) as I want.
Though I have to admit that going by myself gives me a different kind of freedom to go where I want and as fast (/slow) as I want.