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

Puppy 4.31(with glibc 2.19) http://www.murga-linux.com/puppy/viewtopic.php?p=1033696#1033696

Puppy 4.3.1. superseded Puppy430.

There is an enhanced version called Puppy432.

Barebones Barebones431

AnitaOS https://sourceforge.net/projects/anitaos/

Discussion on the advantages of 4.31

Simplified Puppy 4.3.1/4.3.2 Upgrade Center