And where they went in the draft has no bearing on how good they were in college. Even so, they were both first-round picks (Smith was #13, Bradley #2).
I would also argue that "who would you take for one game" is different than an all-time starting lineup.
But all that said, yes, based on their play in college, I would take a frontcourt of Cosic-Smith over Bradley-Cosic. Plus, Bradley and Cosic were definitely both 5s, I can't imagine either of them playing power forward. Smith was more of a 4.