i'm primarily using hsl now (though have long used rgb before that), but have experimented with oklch because of the promise of an even more uniform perceptual color space. the big problem i found with lch & oklch are discontinuities in the valid ranges of lightness and chroma, which functionally dependent on the hue value (from my perspective that hue is the independent variable to set first).

color spaces definitely defy straightforward intuition about them.