According to Charles Poliquin (see his recent article “Manipulating Reps for Gains in Size and Strength” at http://www.t-nation.com/readTopic.do?id=620430, principle 9) and Christian Thibaudeau (see his book “The Black Book of Training Secrets”), to induce hypertrophy, the adequate volume of strength work for each muscle will vary greatly depending on the fibre dominance of the muscle. A muscle that is fast-twitch dominant would benefit from lower volumes of training while a slow-twitch dominant muscle would need a higher volume of work to gain size.
On the other hand, Ian King (see his article “Training Right for your Type” at http://www.t-nation.com/readTopic.do?id=459692) and Chad Waterbury (see his “SOB Training” article at http://www.t-nation.com/readTopic.do?id=561180) recommend training mostly the fast-twitch fibres of a muscle (lower reps), and to a lesser degree the slow-twitch fibres (higher reps), to induce hypertrophy, regardless of whether the muscle is fast-twitch dominant or slow-twitch dominant.
Which training method do you believe is the most efficient to cause hypertrophy? Why?