My team used it for about a year. We hated that it wasn't written in go (which most everything else in the k8s space is). Meaning when we wanted to make a controller or operator to automate pieces of it consuming the libraries met writing your own. We switched and are super happy with argo.

Ahh interesting, I have not used either much at all, but as a proxy for popularity I looked at the GitHub stars, and Argo has grown faster than Spinnaker: https://old-star-history.t9t.io/#spinnaker/spinnaker&argopro...