To me, the 10mm is to automatic what the .357 is to a revolver. Lots of versatility.
I prefer the 10mm. If you don't want 10mm power, then there are several 10mm loads on the market that duplicate the .40 S&W. It can also be converted to fire .40 S&W with only a barrel change and possibly a spring change depending on the load. 10mm magazines will feed .40 S&W without difficulty.
For a compact, I prefer the .40 S&W, since the guns are lighter than the G29, just like someone that carries a full size .357 might select a snub nose .38.
In addition, it greatly simplifies reloading, since I can use the same projectile in both the .40 and 10mm.
Last edited by testuser; December 5, 2012 at 05:06 PM.