There is no "superior" method ... that is where the muscle mags and "systems" make their way, by hawking some special system that works better than the rest. However, the key is really to change the stimulus.
There is different training for strength versus muscle gain. Strength is highly neurological, i.e. how well your central nervous system (CNS) can coordinate motor units. Hypertrophy, or muscle gain, is more placing stress on your body that is new and forcing it to adapt by building muscle.
The reality is that the best method of training may be the one you haven't tried yet. There are so many methods out there ... pyramids, drop sets, superslow, negatives, 21s, 1 1/3 reps, 5 x 5, supersets, ascending drop sets, mechanical advantage sets, you name it.
The key is to try a variety of techniques. Don't judge success by how sore you are, but by how well you meet your objective ... i.e. did you arm gain circumference, or did your bench press press go up? Those are results to look for, and they will be different for everyone. And in fact, for someone who is already doing drop sets, more drop sets might not be the key ... but doing forced negatives may work. That doesn't mean forced negatives are the answer, because those might cause fast burnout and then holistic sets come into play.
Drop sets are a great method ... but don't limit yourself to them!