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)

>>26
Both have dynamic typing, lexical scope, numerical tower arithmetics and high-order functions. The most significant difference is DEFMACRO vs SYNTAX-CASE holywar.