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Puppy 4.31 is the most common version of Puppy 4. It works well on a wide range of computer and may perform better than Puppy 5 if you don't have a brand new computer.
Puppy 4.3.1 release announcement on Barry's blog
Puppy 4.3.1 release announcement on Puppylinux.com
There is an enhanced version called Puppy432.
Discussion on the advantages of 4.31