If you want to be a powerlifter, train like one. If you want to be a bodybuilder, train like a bodybuilder. That all depends on if your goals center around power or aesthetics. Me personally, I care more about looks than sheer power and strength, so I train like a bodybuilder. I mean, I'm still pretty strong, but since I don't play competitive sports, there's really no point in me trying to become some super weight slinging dude.
I'm not trying to sound like an ass but people often make this stuff out to be way more complicated than it really is.
Whatever your goals, know how to reach them. Sounds cliche, but I'm talking concentrated effort vs. sheer effort. If you're going to do something, do it as efficiently as possible.
Also, what do you mean by powerlifters have real size and strength? Functional strength? Like helping a friend move a couch? And bodybuilders aren't all about the pump. If you powerlift, your muscles are going to get pumped up too haha.
If you care about brute strength the most, train for that. Pretty simple! Everything you'd need to know is out there for free... The internet can be a nice place.