5x5 is a good balance between the two types of hypertrophy, but remember that your body is an adaptation machine. If all you do is 5x5, your gains will drop off quickly. To sustain your gain, try varying your reps widely between workouts. 1's, 3's, 5's, 8's, 10's, 12's, 20's. Attack your muscles in every conceivable way to keep your body guessing...and adapting.