5x5 first
then work in the 8 rep range
then after a year you can begin to think of 15 rep range
seriously, no beginner will lift a decent amount of weight for decent hypertrophy at higher than 10 rep range
I went back to this thread to respond to this.
Progressive overload.
You say no beginner will lift a decent amount of weight in a higher than 10 rep range?
So, let's say the beginner ignored this and tried for 12-15 anyway. He selects a weight he can get for 12. He keeps a workout log. He gets his 12 reps. Maybe it was not quite the maximum amount of weight he could have done first time out of the gate for 12 reps. BUT, next time, he focuses on doing more, 13, 14, maybe even 15. Of course, once he hits 15 reps for however many sets he is doing, then next time it is time to increase the weight, right?
So now he goes a little heavier. Now he is at that heaviest weight he can perform, and he has a few workouts under his belt. Maybe he does not get 15 reps with the new weight, but he keeps his log and keeps shooting for more reps, until he gets 15, and the next time, he goes a little heavier. He is now lifting what you call a decent amount of weight, that is, an appropriate weight for his rep range and continual progressive overload (which progress happens quickly for a beginner, as we all know). And the weight continues to go up each time he hits his target reps.
The only possible way a beginner cannot "lift a decent amount of weight . . . at a higher than 10 rep range" is if somehow at sets of 11 repetitions that beginner refuses to do more next time. I do not think that there is any magic line that says the beginner will add repetitions and weight when working out for 8, 9, or 10 reps, but stop doing so if he performs 11 reps.
Progressive overload.
Anyway, my advice was not necessarily for a beginner. I am of the opinion that beginners can do practically anything and make progress. They will make progress reracking the weights others leave lying around. Just lift. All the fancy stuff does not matter. Being a beginner is a magical time of progress every workout.
But folks who have been lifting a while, sticking to 5 reps, as in your post, or 5-8, as I did for a long time, or 8-10, as is often recommended, well, I am saying give it a month of 10-15 on most body parts and 15-20 on some body parts and see what you think of the results. You may be pleasantly surprised. Maybe not, but I have yet to hear of somebody switching to 15-20 reps on heavy leg exercises (e.g., squat and leg press) and not liking the results. They don't like the workout, but that is not the same thing as the results.
If you try it for a month and find that your results are worse than had you been doing 5 reps or whatever you prefer, then, fine, you have learned that it does not work for you.
Progressive overload works in a variety of rep ranges, however, and shooting for growth in a little higher rep range seems to work for most people, especially those who have only worked in lower rep ranges and never tried it (maybe just because it is a new type of stimulus, I won't pretend to know the reason).