Much less THD, with no regard to odd vs. even order and the different degrees to which people tend to be bothered by them. To say nothing of the fact that gobs of feedback are frequently applied to achieve silly low numbers at the expense of sound quality. Anybody still cherishing a Japanese receiver from the late '70s?

>>SETs have much more esp even order, hence they sound richer or fatter.

There's nothing rich or fat about a properly executed SET design driving a pair of suitable loudspeakers. I don't think gross and misleading generalizations do much to advance our collective state of enlightenment regarding the audio arts. . . .