Kubernetes is a full featured, integrated, quite complicated solution, that also includes a scheduler. Nomad, is "just" a very powerful scheduler, not an integrated solution. SquareScale is the solution that happens to integrate Nomad as a scheduler.
We chose to use Nomad because it's a powerful piece of software that does its job extremely well and is 100% focused on what it's supposed to do. It's a wonderful scheduler, and we're happy to help you scale to infinity with it.
Other products shipping Kubernetes end up being mostly Kubernetes vendors in the end; while most of them do it pretty well, we prefer to carefully select each and every component of our platform, so you could enjoy the easiest and most powerful, focused and useful cloud native platform ever.