I've been a professional user of SBCL and LW. They both have merits. LW has better package delivery and a stellar GUI tool. LW is otherwise slow and requires n

I've been a professional user of SBCL and LW. They both have merits. LW has better package delivery and a stellar GUI tool. LW is otherwise slow and requires non-portable APIs to get reasonable performance for some kinds of low level code. SBCL is cheaper, way way faster (in almost every dimension), more portable, better integrated with most OS environments, and provides better static diagnostics. It suffers from having a meh garbage collector and meh delivery mechanisms.