Caveat: I am not a leathersmith, nor do I play one on TV. With that said, I think the horsehide is denser than cowhide, so you wind up with a thinner backing to the holster, and one that makes a better sweatshield.
A gunfight is not the time to learn new skills.
If you ever have a real need for more than a couple of magazines, your problem is not a shortage of magazines. It's a shortage of people on your side of the argument. -- Art Eatman