Geno, duh. Don't need to explain that to you folks. I love the heck out of him even after all the stompings UConn has given Stanford over the years.
Others I highly admire include Walz, CTT, Rueck, Neighbors, and Staley (and Pat, if we're counting former coaches). Mulkey and Muffit are love to hate coaches - I respect them but don't like them (Mulkey for her handling of Griner and all the sexual assault issues at Baylor, Muffit for the constant whining and the "that other player" comments she made about Asia Durr). Their teams' losses almost always bring me joy. I admire Vic and Blair but they're a little too old boy-ish for my tastes.
If the question were reframed as, "if you could grab drinks with any three non-[your team] coaches in the country," the answer would be Geno, Walz, and Graves - that'd be an amusing night out.