Performance question about macOS versions

I'm still undecided about how to handle macOS with 4gb ram only. Please don't give me any advice about that I should upgrade my ram (I know)

From El Capitan, Sierra, High Sierra and Mojave: 1. Are there any big feature differences worth upgrading? 2. I know that usually a newer version will use more RAM but which version is the most convenient to use in 2019 with 4gb of RAM?

submitted by /u/Jajalejandro
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