Well whenever, you are pretty sure what your opponents holdings are it is the best to get as much as you can out of the opponent.

If your top top is like an Ace King type hand then you might aswell let him go crazy since you will be a 70/30 favorite approx. But if your top pair is 10 9 or so. You might want to play the hand really slow since if he has two overs and the draw then its nearly a 50/50