Openshift, if IBM and Redhat want to milk the license and support contracts. There are other vendors that sell k8s: Rancher, for instance. SuSe bought Rancher.
I’ve never used OpenShift nor do I know anyone irl who uses it. Sample from SF where most people I know are on AWS or GCP.
You can always go for the double whammy and run ROSA: RedHat OpenShift on AWS
OpenShift is somewhat popular as turnkey solution for on-premise kubernetes if you can stomach Red Hat pricing.