My allegiances are obvious, so food for thought as a GT fan only...
UNC in the championship = business as usual. Problem for me is Roy Williams is tough to root for. He more or less out-talents teams and does little in the way of in-game adjustments to a fault sometimes.
UVA = most enjoyable style, imo, for those into great basketball on both ends of the court. Drawback is they may enter elite territory and separate from GT i.e., head-to-head recruiting battles would become much harder. This is my pick if I were a non-GT/non-'Cuse fan, but I think the drawback has me leaning to UNC.
ND = similar drawback to UVA... don't need ND separating from the us/the pack either. Plus, they're ND, and while this isn't football I don't understand why they're worth cheering for.
Cuse = Their success does no harm to GT from what I can tell. Offense is hard to watch at times. Defense at least brings something different to the table from many of the rest, though UVA's defense is better.