Actually you need to do both. Heavy weights with low reps will strengthen slow twitch muscle fibers and low weight high rep will strengthen fast twitch muscle fibers. The key to adding size and strength is mainly muscle confusion. You wanna switch your workouts every few weeks including the days and order you do them in. This way your body will never hit a plateau and will constantly work harder. Your body likes consistency so if you're constantly switching things up, it will constantly be working differently to try to catch up to what your routine is
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I was talking specifically about mass; but yes you need both to gain size and strength. But hypertrophy is directly correlated to volume- and hypertrophy is correlated to muscle mass (size). But the general focus of aesthetics has a stronger focus on volume and therefore more easily attainable from high reps (8-15 range). Strength has a stronger focus on lower reps (3-5 range). Can you get muscle mass focusing more on strength, yes; can you gain strength focusing more on aesthetics, yes. You don't necessarily need muscle confusion. Can it help? Yes. But most elite power lifters focus around their main three lifts bench, deadlift, squat- and they focus their accessories on those 3 lifts. They mostly do the same routine repeatedly just varying intensity and volume to peak. I even provided a video on what I was talking about, did you watch it? It's from a doctor who did studies on hypertrophy and muscle gaining- who is also a competitive body builder.
Both recruit both fibers btw; but like you said bodybuilder type training will recruit both I and II more equally than powerlifting which is more fast twitch.
http://www.ideafit.com/fitness-library/muscle-hypertrophy
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