Best MacOS for MBA Late 2010 with 4GB RAM and 250GB SSD?

Inspired by another thread… I recently resurrected an ancient MBA. After thoroughly cleaning it and putting in a new battery that I got cheaply, it’s purring and running like new.

I’d like to give it a new life and I’ve used OCLP before.

Wondering which MacOS y’all would recommend for this lil guy?