I have a Rolair compressor and I love how quiet is it. It also fills all my needs. The model I bought was the JC10 Plus. I know it's not a 20 gal. but I came from a 20 gal and this still works great.
I recently bought one of these Ironair Super Quiet 100L oil less air compressors, and couldn't be happier with it. Way, way quieter than my old belt drive oil tank one, and very fast fill. The link is for here in Australia, but given how pretty much everything is rebranded I'm guessing you'd be able to match up the same unit specs where you are to find the same rebranded unit: