Common Lisp or Scheme?

I'm going to get some basics on functional programming. But there are too fucking many LISP dialects. I know all in all it's all the same shit, but between the two, which one should I use for these little studies?

(And yes, SICP is part of them)

>>29
Lisp is "low level stuff" on Lisp Machines. C would be useless on a Lisp Machine.

hardware is fucking arbitrary. Deal with it.