Simple Question

[Phat Mack]

Betting gives you a chance to take it right there, and may give away less information about your hand.

Checking may be appropriate because you have draws, but no hand.

Of course, it depends on the game and the situation, but most of all the opponent. Does he like high cards? Does he give up on flops with one low card? How big of a hand does he need to make him aggressive?

edit: 'Unknown opponent." Have to work on my reading comprehension.

All things said, playing heads up in a limit game, I am usually going to bet in most situations.