Here are two 15mm Panzer III models I painted.  The one on the right, “311,” was painted maybe 5 years ago, and it’s a Command Decision model.  It’s probably a Panzer IIIF, but I don’t remember the specific variant.  I painted the one on the left, “312,” a week or so ago for our annual WWII game.  It’s a Peter Pig PzIIIE variant.

It’s hard to tell which differences between these models are due to the different variant they represent, and which are just sculpted differently.  Overall, I much prefer the quality of the Command Decision model.  The Peter Pig castings have a rougher surface and are less detailed.  The drive wheels on 311 are toothed and have properly shaped holes in them (not round) while the PP wheels were obviously just done with a drill bit.  The PP model is larger overall.

In practice, I don’t think these details show very much on the game table, but if I have a choice between Command Decision and Peter Pig for a specific vehicle, I’ll choose the Command Decision.