Sound ratings don't mean a darn thing without a properly designed and installed duct system and no manufacturers claim has any control over that.

Just a thought on this quiet thing that seems to be on everyones priority list. You get a beautifully quiet furnace. Just perfect. You don't hear squat. You don't even know it is working. You leave one day and it actually
isn't working because you can't hear it to tell the difference. Then come home with most of your pipes frozen and the cat and dog cuddled up together to keep warm. Prime ex. my stat crapped out yesterday. couldn't hear the
relay click. Yes woke up with no heat.

I have installed both furnaces. Either one is very quiet. Both are sealed combustion units and can be enclosed in an insulated closet unless there is an atmospheric combustion appliance in the same room. I'm assuming the furnace will be installed with 2 vent pipes. The Rheem unit has the capability of running at lower Btu inputs and will be quieter during mild outdoor temperatures.