Which front-end technology is YOUR preference for an enterprise level application?

Hello Experts! I would like to have your opinion about for an enterprise level application, what will be your preference as a client side technology?

My concerns would be:

Learning curve (when we add new member in the team)
Manageability
Scalability (as requirements never ends)
Testing (Automation mainly)
Build and deployments
If anything else that comes from your experience

Thank you very much in advance...!!

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