If you go with the Glock platform, why not get the .357 sig and by a 9mm conversion setup in 9mm. Shoot more often in 9mm and save some change, shoot more sparingly in .357 sig to maintain proficiency. Practice with 9 carry .357.
The .357 is far from being out of breath as far as popularity is concerned, more choices may be on the horizon. That being said, Underwood may grow, giving more confidence as a supplier. He may never be as big as the big three (or care to be) but being a mainstay such as Corbon or BB is a strong possibility.
Getting the Glock platform in .357 is your "cake and eating it too" scenario once you have the conversion in 9mm.
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