Passive - with an explanation.
My reasoning is this: First of all, I'm old school and damn proud of it.
Secondly, and probably most importantly, the couple of times I have put my passive bi or tri-amped system up against a powered system that was using
a combo of (2) EON-G2's for mids and highs and (2) B-52's and the second time against a system comprised of all Mackie powered components, I kept hearing the same comment:
"Damn, your system is so much cleaner than his"
Now that's not to say mine was better, just different. Both instances, I watched both jocks red-line the mixer. Granted, my system was a little more esoteric featuring dbx compression and Ashly EQ components, but the key in the mix, was that I wasn't running out of headroom due to red-lining.
I was running a very simple system with (2) Peavey 4C's in the bi-amped rig, the first time that powered (2) E.V. SX500's for mains and (2) E.V. Sb180 folded subs, and the same system the second time adding only a Yamaha P-2000 amp to run the subs and (2) Yamaha S112's into the mix for extended high end.
The one thing I really got off on both times, was that the bass from my subs hit so hard (but clean and tight), that you could literally feel it hit you in the chest, and reached so low, it felt like your guts were churning.
Just my thoughts........Merry Christmas all.