Also, one can't generalize that powerlifters are the strongest, or olympic lifters have the most "functional strength", or the BB's train for the "pump". i don't know where some people some get these ideas. There are other variables that play a factor in determining those things. I certainly don't lift for the pump. My goal is "bodybuilding" but that to me means lifting more weight or doing more reps each workout. I lift big to get big.
"Functional strength" is a relative term. Functional for what? TO excel in a sport, improve one's ability to carry out household chores, to become a good at fighting, to become a great lover? However you define "functional", I don't agree that either BB or powerlifting is better suited to developing functional strength in one area. There are other factors that (such as specific training exposure, motivation, physiological characteristics, biomechanics, kinanthropometry, etc.) will ultimately determine level of "functional strength."