[AlexB182]

Well normally, I'd bet that turn most of the times, especially as it makes this board a little drawy (for BD draws of course). But as you mentionend, you wanted to go for some pot control here then you have to do this on the turn cause you can't be sure that you will be able to control the pot size on the river by checking behind.
Just for the records: I'm betting here all three streets pretty much for value and would only start thinking a little if he raises me somewhere along the way.