Here's an idea, if you have done this already, feel free to skip it.
Go to the range with both pistols and a pair of NRA B-8 targets. Mount both targets at 10 yards. Cold, shoot 10 rounds through each gun in 10 seconds. Score your results out of 100.
Are all rounds in the black? Does one gun or the other have a significantly different score? That may help your decision which gun to focus on.
This is one of my favorite drills for keeping me honest. Bearing in mind I pretty much suck at shooting vs. most of the members here, my average with a Glock 19 over the last 18 months is about 85. But I really like it as a drill because you have to shoot accurately, rapidly, and doing it cold means it represents your "best" performance you can do on demand.
Just an idea.