I heard both of these in system's at the dealers and at a friends...The Cary SLI80 by far the best.I must state that the Cary was the Hot Rodded (F1 version)..
By no means the Cayin was that bad,but you can't beat that Cary sound.They are 2 different tube sounds,something you would have to judge for yourself if you can do the demo.
I think they were discontinuing the 88T and the 100T has replaced it.
I would have like to hear the Cayin 100T but didn't have access to it.
I did here the Cayin 100T just last week by itself on a pair of Von Schweikert VR4sr and liked it,but no Cary around to compare it to.