I found youtube videos comparing sound from the Champion and Hondas you are looking to compare.
Something to consider; hearing loss. I have the higher frequency hearing loss and any genny that makes noise that is higher pitched is going to sound quieter to me. As an aside, it takes more energy to produce low frequency sounds than high frequency sounds. This is because there are more sound waves per second with high frequencies. High frequencies are more directional as well and more easily blocked than low frequency sound waves. Anyways, what may sound louder to one person may not to another.
