I like the idea of doing both. Good thinking!
This round I am going to do plyo legs. The squat rack I want is not available yet.
Right now I am focusing on weight (fat) loss. After I get to where I want to be, which I'm hoping will be around the time I finish my first run through the STS system, I'm going to focus on muscle gain.
I've discovered that putting on muscle while losing weight doesn't tend to happen for me. The best I seem to be able to do is maintain what I've got, with perhaps tiny gains. I think I need to increase my calories to gain muscle. Thus, next time through STS, I'm going to focus on muscle gain, and will be doing the squat rack option (if I have it by then). I'll be upping my calories, and will expect to gain some of the fat back, but hopefully more muscle. (It's hard to find that balance.)
I'm experimenting, to see what works for me.