The short answer to that question is the right one for the job. That means there is no single network driver that is the right fit for every situation. If you're doing work on your laptop, running with swarm inactive, and you just need your containers to be able to communicate with each other, the simple bridge mode driver is ideal. 

If you have multiple nodes and just need container-to-container traffic, the overlay driver is the right one to use. This one works well in AWS, if you are within the container-to-container realm. If you need container-to-VM or container-to-physical-server communication (and can tolerate promiscuous mode), the MACVLAN driver is the way to go. Or, if you have a more complex requirement, one of the many remote drivers might be just what the doctor ordered. 

I've found that for most multi-host scenarios, the overlay driver will get the job done, so I would recommend that you enable swarm mode, and give the overlay driver a try before you ramp up to any of the other multi-host options.