I don't see your point, but I should have clarified more:
Kops == AWS install
Rancher == Easy small cluster on-prem or private cloud. GUI push-button setup
kubeadm == CLI tool to set up a cluster manually with basic settings. Not very flexible, but can get a cluster working in minutes.
kubespray == Ansible playbooks for setting up k8s cluster. The most powerful of the bunch, especially if you're familiar with ansible. This is the preferred way to run it in production I believe, along with customizations on top.
Kops == AWS install Rancher == Easy small cluster on-prem or private cloud. GUI push-button setup kubeadm == CLI tool to set up a cluster manually with basic settings. Not very flexible, but can get a cluster working in minutes. kubespray == Ansible playbooks for setting up k8s cluster. The most powerful of the bunch, especially if you're familiar with ansible. This is the preferred way to run it in production I believe, along with customizations on top.