This is personal preference here, but I wouldn't get a Glock smaller than a Glock 23. The 'subcompact' guns from Glock really hamper your ability to hold the gun properly and get satisfactory accuracy, especially 'under stress' when you already have enough shit to worry about.
If I had to pick between either a subcompact Glock 40 or a 38 snubby, I'd pick the 38 every time. It also has the added benefit of a 'point and click' interface that helps if there happens to be a misfire.
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