I couldn't agree more that you should mix the both together if you want to really make the best gains.
I mainly use powerlifting to push me to a new weight set, (you have to tell your slow twitch muscles whats up).
However, I do happen to train my Bicepts in more of a BB approach since I use them a lot on my heavy bent over rows.
(I'm only at 120lb dumbels for reps of six, trying to get back to 150lb for x5)... And I do only work out these muscle groups once a week.
I also train my inner thighs/groin area and outer with lighter weight as well as my hamstrings on leg days on more of a bb approach.
I do notice that medium weight with a squeeze gets the best pumps for me. However, heavy weight with a rep 4-6 where the 6th is borderline failure
always gives me the best sore as hell but i know your getting bigger feeling. (I always try to mix these styles up)
I tried just the BB approach at 160lb but got stuck at 180lb two years later.
I switched to incorporating the power lifting approach and peaked out again at 210lb after another 2 years.
Granted I have a large frame for only being 5'9.. ( measuring your wrist circumfrence, ankle circumfrence, height etc into a formula)
so as stated you really need both, as well as listening to your body to get the best gains for that day.
Because I don't see whats wrong with looking big and lifting big : )