When comparing Guile vs Armed Bear Common Lisp, the Slant community recommends Guile for most people. In the question“What are the best Lisp dialects?” Guile is ranked 4th while Armed Bear Common Lisp is ranked 19th. The most important reason people chose Guile is:
Guile makes it easy for users of your application to write extensions without needing to understand the plumbing of your program.
Specs
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Pros
Pro Easy to customize and extend applications
Guile makes it easy for users of your application to write extensions without needing to understand the plumbing of your program.
Pro GNU's official extension language
Chances are a system running enough GNU software will already have it installed.
Pro Excellent documentation
The documentation provides conceptual overviews, tutorials, and a detailed reference for all commands, functions, and operators.
Pro Fantastic interface to C, C++ in both directions, embedding guile in C/C++ and embedding C/C++ in guile
Pro Can be integrated into java programs for scripting capabilities
Pro Fairly simple to learn and use
Written and interoperable with Java.
Cons
Con Weak copyleft
LGPL
Con The java API isn't always enough
Some of its features are made private and can't easily be modified from java.
Con Can be slow and clunky because of the java overhead
It is using java.
Java is slow.
Ergo: abcl is slow.
