Here it is ...http://www.avsforum.com/avs-vb/showt...light=paradigm
The last half touches on the 3400. The reality is, without objective data it's tough to call. Slightly bigger driver in the Paradigm, much larger box with the SVS, but more ports on the Paradigm. Amp specs were about the same IIRC, though the new PB12NSD has a 400 watt amp.
Low end may still go to the SVS due to the box size advantage I would guess.
Personally, if space wasn't a concern, I'd probably go with the SVS with their new DSP amp.