I'm not sure this is the best way to...

John: We're going to try to solve this problem by using brute force.

Alice: I'm not sure this is the best way to approach it. It might be more efficient to use a different method.

John: Oh, you're right, maybe we should try a more analytical approach.

Alice: Exactly. I think we'll find a better solution. I still think I'm not sure this is the best way to proceed with the current plan.