Use the kenwood since you have it, Ive never had one fail me, but I only owned two. Hifonics make affordable high wattage rated amps, but I see alot of problems with them here on this forum. Many people here would say that I buy overpriced stuff like alpine,JL,etc, but all my systems last many years with no problems. I would choose kenwood over the hifonics only because I can buy it locally and deal with problems/returns more easily, I have never known of a local hifonics dealer around here, are their any quality car audio dealers/installers that carry hifonics? Or is it strictly mail order? Sorry to dis, but thats just my opinion.