roof air or basement

I've had both roof and basement and much prefer the basement air. In the living area, there is no noise except the whisper of air through the ceiling ducts. Ours, like most, is not under the bed, and if anything helps us sleep as it provides a "white noise". The main reason, however, is that I can purchase whole-house allergen air filters (14X20")from Wal-Mart or Lowe's. The improvement in the quality of air within the coach and the reduction in dust is significant. As for maintenance, I've downloaded the service manual for any A/C tech to look at, and when I had a failed capacitor and circuit card I called the manufacturer (AirxCel)and had the parts shipped overnight.