Noun
tough call (plural tough calls)
(chiefly US, idiomatic) A choice or judgment which is difficult to make, especially one involving only two alternatives.
Drinking bear is easy. Trashing your hotel room is easy. But being a Christian, that's a tough call. That's rebellion. Alice Cooper
For me, I always wonder what's worse: an emotional betrayal or a physical betrayal? That's a really tough call. Hilarie Burton