Used Marantz monoblock or new Dayton/Emotiva mono?

Hi folks,

I need a cheap monoblock amp (no more than $150) to power my passive sub (an NHT SW2), and I'm trying to decide between a used Marantz MA-500 and a new Dayton APA150 (which appears to be identical or similar to the discontinued Emotiva BPA-1). The Marantz is 125W into 8 Ohms and the Dayton (when bridged) is 150W into 8 Ohms, but both seem powerful enough to power the sub. They are both about the same price, so it's just a matter of which will sound better. Anyone listened to both or have any thoughts that could help with the decision? Thanks.