I haven't dived into Kubernetes yet, but I set up Rancher for our new application and it has been nothing short of amazing so far. I can't express how happy we've been with it.

I previously tried the Mesos/Marathon route (with Mesosphere and then again with Mantl) and that was nothing but a huge waste of time due to all the maintenance that was necessary for all the required servers. With Rancher, it's just spin up a container for each host with a single command and you're done.