The two features that worked easily in Flux that pushed my team to pick that over argo are 1) Flux can source helm values (and postRender variable replacements) from configmaps and secrets on the cluster; This allows us to setup each cluster with environment specific information at creation time (immutable information about the cluster essentially) without having to copy that data to our flux repos and 2) The ability to use kustomize to patch manifests from helm post-render as well. You can patch anything before it's applied to a cluster, which allows you do deploy upstream charts without having to fork them for your needs.