When comparing Clozure CL vs Steel Bank Common Lisp (SBCL), the Slant community recommends Steel Bank Common Lisp (SBCL) for most people. In the question“What are the best open-source Common Lisp implementations for Windows?” Steel Bank Common Lisp (SBCL) is ranked 1st while Clozure CL is ranked 7th. The most important reason people chose Steel Bank Common Lisp (SBCL) is:
Has active contributors, including Google and some quantum computing companies engineers.
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Pros
Pro Apache 2.0 License
Recent versions have the more permissive Apache license.
Pro Heavily developped
Has active contributors, including Google and some quantum computing companies engineers.
Pro Type inference and type checking
Incorrect type declarations are treated as errors. SBCL can deduce types quite well.
Pro Actively maintained
Bug-fixes, performance improvements, refinements. New ports.
Pro Fast native code compiler
SBCL (and CMUCL)'s compiler, Python, produces optimized native code.
Pro Easy install
Portacle makes it easy to install SBCL, Emacs and SLIME.
Pro Free Open Source Software
Parts of SBCL are licensed under a BSD-Style license. The rest are in the public domain.