For me it's mostly an aesthetic thing. It's difficult to explain. I just find simple things more elegant than and Scheme is terser and all the implementations

For me it's mostly an aesthetic thing. It's difficult to explain. I just find simple things more elegant than and Scheme is terser and all the implementations (that I know of) are lighter than CL. It' s also very easy to embed in C code. I'm by no means an expert, though.