I'll give my 2 cents.....but only cause I was invited to do so, lol
The way to develop muscle is to train it progressively. This concept is clouded in modern "bodybuilding" literature. "Trainers" advocate all sorts of crap, and the magazines publish all sorts of crap, for somebody either natural or not living on obscene doses of drugs, the most efficient way to build muscle is by training compound lifts in a progressive fashion.
I could write a 10 page post on this, but I will try to get to my point and if anybody has any questions, I'll try to elaborate.
When you squat and work up to 200x8, then the next week you work up to 205x8, and 210x8 the next, that is progress. Training is quantifiable, and if you're eating for your goals, you'll like what you see. If you squat 200x8 one week, 135x15 the next, 225x4 the next, you're all over the place and haven't really progressed with anything......that's my problem with the 'shotgun' approach and training soley for soreness/pump. That is also why most gym goers are plateaued and frustrated and why we have so many 6' guys on the anabolic board who weigh a whole, whopping 175lbs and are plateaued despite 'perfect training for years'.
That being said, my advice is to squat and squat first, train it progressively and eat for your goals. Getting better at squats grows muscle.....making something harder than it has to be (supersets, super slow reps, pre-exhausting, etc etc) is an inefficient waste of time. Look at it this way......which girl will have more developed legs? The one who squats 135x10 or the one who can only squat 45x10.....I hope everyone said the 135x10 girl. Now.....does squatting 45x10 build any muscle?? no....Does squatting 45x10 on a pair of ice skates while drunk make it harder? Yes....does it being harder build any more muscle? NOOOOO......so, just train the big stuff first and get better at it, it really is that simple.