If I am limited to 10 round magazines, then I'd probably want to go with guns that get the most utility out of those 10 (+1) rounds.
- For a compact concealment gun, Glock 26 with 10 rounds of 9mm.
- For a normal sized gun, Glock 30 with 10 rounds of .45
There would be no reason for me to want to own or carry a Glock 17, S&W M&P full-sized, or similar sized guns because the sole reason for a gun that large is the extra capacity.
I might consider a Glock 23 since I like the overall size of the gun and giving up 3 rounds isn't *that* horrible, but still annoying.