Personally I chose .357 magnum over 10mm. I had a Glock 20, but sold it. I have a Ruger GP100, 4", .357 magnum though.
10mm is much more difficult to locate than .38spl or .357 magnum. More expensive, too. That's the primary reason I chose the way I do.
The only thing necessary for evil to triumph is for good men to do nothing.