Opinion on move for black

Wondering if the stronger play is to move bishop to a4 or towards the center on d6. Os their any general rule in situations like this. Any other moves you see too, lay them on me.

Thanks

Wondering if the stronger play is to move bishop to a4 or towards the center on d6. Os their any general rule in situations like this. Any other moves you see too, lay them on me.

Thanks