rethinking a standard bet spot

[DJ Sensei]

You open A[img]/images/graemlins/heart.gif[/img]2[img]/images/graemlins/heart.gif[/img] from MP, button and BB call. no particular reads, but assume theyre standard online players. also, stacks are probably 100x or so. standard.

Flop is A[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img], SB checks.

Pot is like 11x bb, stacks are like 100x bb.

Whats the best move and why? (and like, dont post without thinking about it much, thats useless)

What if remaining stacks are 50x bb?