I wouldn't go by SNR alone in this case. Clarion rates their SNR value at 1W into 4Ω.The Power bass and Clarion are the only 2 there that do rated. Id go with the PB. It has a lower SN ratio which will help. Only problem is it has a high THD. The Clarion has a lower SN ratio, but is CEA compliant, and has a wide range of LPF and HPF frequencies it can filter out.
How does PB rate theirs? At maximum power like everyone else?