Are SET amps "quieter" than push/pull tube amps?

So had a recent discussion with a dealer regarding the sonic qualities of SET amplifiers, for potential use with high efficiency horns.

The dealer (very knowledgeable guy) contends that push pull amps will be too "noisy" when used with high quality horn speakers (think Avantgarde, Cessaro  etc.).  

I ask as I was considering combining horns with either VAC or ARC amplifiers.

Can anyone explain to me why a low powered SET would be more "quiet" and work better with such speakers than an ARC Ref 75 or VAC 200iq (as examples)?

BTW I realize that noise can be an issue with high efficiency horns.  So is it that most tube amps have too low a signal to noise ratio?  Or some other factor?

Thanks.