this is an easy question.
If im in my favorite plane, PJ, I go for the one that is the better in the vertical and accelerates beter. If its a choice between bouncing an La7 or a C202 i'm going to go for the La7 first.
This holds true for any plane i fly. Kill the greater threat. Sometimes though a c202 may be a greater threat than an La7 in a different situation. So i work on the 202 first, or both at the same time because i know the La7 is going to be a problem if i dont pay attention to it and just work on the 202.