Wiggle

Experienced weightlifter here: There is a balance here though. If you do powerlifting style training (ie alot of heavy single, doubles and triples) you actually won't build much leg size. Instead you will end up with very dense legs. This has happened to me, I've weight trained for years and focus on strength and heavy sets. This makes you strong and very dense (I've had people comment on this, saying I felt different than I looked). If you want bigger, plumper looking muscles you'd want to do a lot of weight training in the mid to upper rep range (8-15 reps per set). Again, there is no black and white here, just my own experience.