For the half the year when I am competing every weekend, I am only interested in the gun I am competing with. Other guns are a distraction.
For the other half the year, when I am not competing, I love shooting different guns. I find it particularly fun to get something new to me, like the P10-C or VP9SK, and see how well I can shoot them with a few days focus. Next up is the APX, and I can't wait. In a month or so, as competition time nears, I move back towards singular focus.
Neither approach seems right or wrong, it is whatever floats your boat.