Pros & Cons:
Pros for the Passive set up is that you can get another matching sub down the road for another $290 to add more boom.
Cons for the passive set up is that (if you don't have, or buy an external electronic crossover) you'll be relying on the internal passive crossover that's built into the sub which leaves it sounding a little muddy.
Pros for the powered set up is that it's all in one powered which as said before results in a more efficient set up.
Cons the thing is 97lbs. Vs. 73 for the peavey + To add another matching sub it will be another $700.
I am 100% sure the B52 will sound better.