Simple Question

[Phil153]

You have A[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img]. You raise pot preflop from UTG, one LP caller, blinds fold. The flop is K[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/club.gif[/img]. You're first to act

Which is preferable against an unknown opponent - betting or check-calling?