Blood Volume Training is what Craig Titus advocates. It means doing about 4 exercises for 4 sets each in the rep range of 12-20, with minimal rest between sets. I know that him and alot of IFBB pros use higher reps these days but the guys that have that thick dense look are the ones that train heavy in the 4-8 rep range. Look at Lee Priest, Dexter Jackson, Kevine Levrone, Johnny Jackson, and even Dorian. Those guys all have that granite hard look to their muscles and not that puffy, ballooned up look of guys like Titus, Kamali and Chicarillo. Those guys advocate the higher rep range type of training. Nothing against those guys but i think they would look better if they trained with heavy ass weight.
Ronnie on the other hand does train with higher reps too, but he also throws in heavy max set on the basic movements for 4-8 reps. I'm sure doing both types of training would be the best. I personally hate training with higher reps. Don't have the attention span for that!!!LOL