I've come across discussions on hi weight low reps vs low weight hi reps, and learned that we need to do both of them with the reason that they target different muscle types available in our bodies, thus by doing both of them we can improve all muscle types, thus achieving optimal training.
But I've also read elsewhere that hi weight low reps scheme produces strength and not size/mass, while low weight hi reps scheme produces size/mass and not strength. I am not sure whether this is because of the different muscle types addressed, any explanation?
If above is true, does this mean if my main goal is to gain mass then I should concentrate more on doing low weights with more reps in my exercises? In fact, why should I cycle to the other scheme if I'm not that interested in becoming very strong? Or is mass so related to strength that eventually I have to work on strength as well if I want to continue gaining mass, thus like it or not I have to revert to hi weight low reps as well to gain more mass?