I don't have a definitive answer for you, but perhaps this will help.

• Class::Std is written by TheDamian, referenced by PBP, and it's the only one I've actually used. From what I hear, it has trouble with threading, but I haven't done any threading, so I haven't cared.
• Object::InsideOut seems to be the kitchen sink version, written after Class::Std, in an effort to address its drawbacks. It may be slow.
• Class::InsideOut is the small and simple version. I don't know anything about it.

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