The first pic is Snap On on top, then Matco, Proto Taiwan in middle, Mac long pattern Knuckle Saver, and regular Mac Knuckle Saver on bottom. I apologize for the pic. It is impossible to get them all in one picture and straight on. They are all 5/8" except the Snap On is 17mm. You can see the Proto is the thinnest of the 5, but it is made in Taiwan and may be thinner than the USA version. Perhaps the USA Proto is the same size as the regular Mac KS which is a hair thicker. The Proto and Matco are also ratchet wrenches, but unsure if that affects width. I personally love my knuckle savers and never had a problem. The long pattern KS are my favorite's because of their large, squared necks. Let's be honest, those thin wrenches do hurt sometimes when you're really hanging on them.
The other picture of the open ends has Snap On FD on top, Matco opti-torque middle, and Mac/Proto ASD on bottom. The Matco and Snap On are basically the same and will leave a heck of a bite in the fasteners. People complain about that, but that's what they were designed to do.