When comparing MIT/GNU vs Armed Bear Common Lisp, the Slant community recommends MIT/GNU for most people. In the question“What are the best Lisp dialects?” MIT/GNU is ranked 7th while Armed Bear Common Lisp is ranked 19th.
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Pros
Pro Can be integrated into java programs for scripting capabilities
Pro Fairly simple to learn and use
Written and interoperable with Java.
Cons
Con Not made to run as standalone
Cannot be compiled to a standalone executable, only to byte code that can be run from the interpreter; and cannot be conveniently interpreted by the interpreter from the command line.
Con Not very well-documented
The documentation is very sparse.
Con Poor Windows support
Con Ill-designed interpreter's interface
The interpreter does not support the use of the left and right arrows to move the cursor in the code and the use of the up and down arrows to navigate through the history.
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.