How important is it to get a good flex at the end of the rep, even if it means using less weight?
For instance, assuming all other factors are equal, who gains more mass faster:
(A) the guy who concentrates and does a rep slowly and controlled in good form and feels a good hard contraction at the end of a rep using less weight, or
(B) the trainer who does a "controlled," non-sloppy rep faster but without really concentrating and without getting a decent flex at the end (ie--just moving the weight up and down but *with* relatively good form and without being excessively sloppy)?
Let's assume the first guy is using the max weight he can to get a controlled rep with a good contraction, but it is less than the second trainer, who just moves the weight, not sloppily but without a good contraction and without really feeling the movement.