We’re taught both metric and US customary units in school. I prefer metric for most things, to the point I have a metric-only tape measure among other things.
However, I’ll die on the hill that Fahrenheit is superior for ambient air temperature. 0 degrees to 100 degrees neatly encompasses the range of average surface temperatures seen throughout the year in the contiguous US.
I was not taught both, but I try to use both when I post stuff on Lemmy, for the sake of readers. I typically have to look up the conversion.
Beyond that, I’ve started baking in metric because my super-precise scale handles it nicely, and there are an absolute ton of metric weight-based recipes but not a lot in imperial. Volume-based baking is just bad. It never turns out consistently. Volume is ok for cooking, not baking.
I also use Celsius for temps in games because that’s usually the default, but not meatspace because everything around me is presented in freedumb units. I don’t really have a preference between the two, but I’d just love if we switched to kelvin. I’m a big fan of scales that start from 0. It’s not even remotely practical for everyday use, but it IS precise!