Hi Phill,

It is difficult to say. It is always a question about your strategy and how you use the different tools.

To get a good profit in FB, you usually is trying to get people to interact with your message, so you can get the message out to all their friends.

In display you are trying to deliver a powerful message, so people just need to buy your product.

In Adwords, you can get very target traffic. It is all about choosing the most valuable traffic.

Adwords usually give the highest profit and the biggest turnover.

Thanks,

Brian