I find mesos fairly simple to administer. `service mesos-slave restart` / `service mesos-master restart` is often enough, though it has the standard complexities of running ZK. That said, when your org gets to a certain size, you almost always end up with a couple of ZK clusters hanging around for some service or whatnot.

The logs are _very_ good, and most unintuitive behaviour will often trigger a decent explanation in the logs.

That said, kube is a lot more integrated; you prob will spend more time setting up stuff like Mesos DNS or Bamboo (that's my plug).