I can't believe you're asking that question after being around here for the last 4 or 5 years ?
you know (or should know) that the fastest way is to start pulling and squattin !
frankley I'm disappointed in you !
He's mostly spamming here.
I;m really even more disappointed that he posts his question HERE, on the training board.
If he had paid some attention, he would know that you can't train for mass or definition or whatever. It's a quesiton of nutrition.
With the best diet, you will grow if you stimulate the muscle, no matter if you do higher reps like in HST or Giant Sets or do a higher load like in HIT or DC.
I did all of them, actually i still do and change the style every 6 months to a year or so. I grew on all of these styles, just do little adjustments inside the style throughout the 6 months.
With all programs, increase the weight constantly and have a week or 2 off every 6-8 weeks.