A dedicated headphone amp should generally sound better than the headphone socket on another kind of component.
I'm sure Ayer does tell you that the Ayer headphone driver is very good, and for what it is, it probably is. But if it's not a headphone amp, it's an afterthought to the main purpose of the component, and I'd almost guarantee you the McIntosh headphone amp would sound far superior. As always, try to give a listen first if you can.