Which version of macOS for 2010 polycarbonate MacBook and Air?

I have a couple of older MacBooks, and I want to use OCLP to make them more usable. Both have SSDs. Currently have 8GB in the MacBook, and I'm not sure if the Air has 2 or 4GB because I don't have it with me right now. I know there's some performance issues with later macOS versions on older hardware, so I'm soliciting opinions on which version would be best for them.

submitted by /u/TrekChris
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