Thanks! Never worked with Argo CI/CD, but I do not agree that Gitlab CI/CD overtaken Jenkins, you can find different statistics with google which shows you that Jenkins is leading CI tool.

I think Jenkins is the best for Continuous Integration and best tool for builds and gitlab CI is more about Code Collaboration and Version Control - so it's depends on your needs what you choose. I general I think both tools has more or less same functionality, so it's hard to imagine for me how Gitlab CI may win this battle, but again if we are not talking about Code Collaboration and Version Control.