So you're asking to compare PLT Scheme with Common Lisp?
There's a many Scheme vs CL comparisons and flamewars all over the Internet.
I prefer CL, for a variety of reasons, but I accept that there are plenty of people who prefer Scheme for their reasons, and there are indeed certain things PLT is better at, and certain things CL implementations are better at.
There is no 'best' programming language.
Google if you want a feature comparison, you'll find many.
I could write one myself, but I'd rather avoid another pointless flamewar.