Considering you can mind control everyone in StarCraft, even Heros (UMS use stronger units of every type and more, like Infested Kerrigan), I'd mind control the heros
Offtopic: Speaking of that, the other day I played a UMS (use map settings, scenario in SC) where I choose an archon that would evolve to something else I didn't knew. And so, he evolved to other archon, and then to a dark archon.
Mind control all the way. The final boss, that was Kerrigan, but stupidly strong, was so sweet to mc
Laughed my ass off about the stupidity of the map creator