When comparing Embeddable Common Lisp vs PicoLisp, the Slant community recommends PicoLisp for most people. In the question“What are the best Lisp dialects?” PicoLisp is ranked 9th while Embeddable Common Lisp is ranked 16th.
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Pros
Pro Compiles to C
Your code can run (almost) anywhere C can. It is easy to interface with existing C programs.
Pro Integrated database and Prolog engine
Pro Fast code execution speed
One of the fastest code execution speeds compared to other Lisp dialects.
Pro Simplicity
Compared to other Lisp dialects, it's simple and doesn't have unnecessary features.
Pro Tacit
Code written in is short and easier to understand most of the time.
Pro Foreign function interface
The language has built-in FFI for C and also interfaces with java(via ersatz)
Cons
Con Lack of Floating point data type
The language does not have floating point numbers only scaled fix-point numbers. Scaling of numbers is more work than directly working with floats.