It really depends.... You have to think about the other players. How have they analyzed your game, do you only go in when you have a monster hand or do you go in when sometimes you don't. You have to think about what your players are going to think when you place a big bet. Because if they see you make a big bet and you are genrerally a conservative player they will know to fold. If you are a pretty conservative player I suggest a small raise or just call the pot.
If you are not generally a conservative player and are known for raising alot pre-flop I suggest just doing that. That way the players don't know if you really do have a hand or not.

Raising 4x or 5x the BB and hope to get called