this post was submitted on 18 Oct 2023
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TL;DR: Use SBCL or CCL. Others—maybe, but likely in their own specific niches.
I want to give more chances to implementations there are, so here's my experience, in the order of preference:
I haven't tried Clasp, Corman, CMUCL, and LispWorks. So no review for them. I tried GCL, but let's not talk about that.
CMUCL is basically a worse version of SBCL. SBCL is a fork of CMUCL with the goal of being more maintainable. Some things have been backported between the two, and there maybe a few things present in CMUCL that aren't in SBCL, but I think most of the interesting things have been added back in.
Clasp is to C++ like what ABCL is to Java. I haven't done much more that fire it up to see if it would run, but it's C++ integration looks fantastic.
CMUCL is also way behind it platform support. CMUCL is mostly limited to being a 32bit application (IIRC). SBCL OTOH supports various 64bit platforms, incl. ARM64 on Linux and macOS.