I'd go with the Rythmik. I think the SVS would have more output at the lower end of its tuning point though, so it might do deeper bass a bit better. I think the Rythmik might be a bit more articulate than the PB12, but I say this having not heard the PB12. I have compared the Rythmik to similar ported 12" subwoofers though, and found it did have a kind of articulation they lacked. I thought the FV12 was an excellent subwoofer.