Gosh. I asked myself whether this was a test of strategic thinking, blind devotion, or whether you can tell your boss what they want to hear. I ended up taking the high road, and said that I didn't have enough information to make that call.
Pretty solid question. But it came pretty early in the interview process (during the phone screen). Normally, I wouldn't expect this sort of question until the in-person interview loop, after the overall fit had been established.