excercise selection question

I have a question reguarding choice of excercises. Would it be unneccasary to do something like, a clean movement and a snatch movement in the same workout? Or a front squat and a back squat? Or a Bench Press and an incline BP? Basically would it just be best to chose one and rotate the varriations as the weeks progress? For example say on monday you do Power Cleans, then the next monday do Power Snatches, next week hang cleans, so on and so forth for the squats and BP movements also?

And are clean pulls very useful for regular work in a program, or would it be better to throw those in every now and then?