Its pretty much a moot point. It doesn't matter what you're doing if you aren't eating enough - the ONLY way to gain weight is by eating more food than you require.
If you have that sorted, even then the rep range isn't terribly important. Over the years i've done a tonne of different programs and haven't had any trouble putting on muscle because my diet was on point.
So long as you are progressively overloading in some way, and eating, you will grow.