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What is the best rep range to use when lifting weights?
Why limit yourself to a rep range? Lower reps are great for strength and some size. Moderate reps for size. Higher reps endurance. Super high reps for stretching and ligaments/tendons. So there really isn't a superior rep range and it varies even with your training - as you train longer, what used to take 4 - 6 reps can be done in 2 - 3, for example. So I train at 20 reps, at 15 reps, at 10 reps, at 5 reps, at 1 rep, and everything in between!
Periodization is a science that examines/models training and demonstrates that the most effective way to see gains over time is to move through various rep ranges, essentially starting in the moderate and moving down, i.e. go higher for endurance, moderate for hypertrophy, then low for strength to train the new mass how to function efficiently, then cycle back around, etc.