We did not evaluate other options because the only one that we knew was Docker.

Google Kubernetes.

We looked at VMware and Hyper-V, as well as Amazon. But, we stayed with Rackspace Docker becuas ewe already know that this is doing the best in terms of what it is offering.

We did not evaluate options other than Docker.

I tried Docker because there was a bit of hype around it. I had been using Vagrant. I did not know about things like LXD before starting to experiment with Docker. If anything, I have learned about alternative container technologies that I might evaluate later.

I don't use any other software, given that Docker is our solution.

We did look around for other options but nothing could compare to this solution.