See also: recent discussion "5 shortcomings of Helm"
If would could help we would love to talk to you!
I only learned about glasskube from your mention of it, so I haven't had the chance to kick the tires on it, but in our specific setup, "gui" is an antipattern. I'll try to dig into it further to have more concrete pros and cons
To set expectations, we're currently on helmfile because of its ability to inject env-vars into manifests pulled down from specific git shas