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)

Neither of Common Lisp or Scheme have memory pointers, meaning you can't have pointer to a memory cell, beside it's name. It's a major design flaw for a general-purpose programming language.