If you ask me personally, I prefer when NFL teams have matching helmet and pants colors for when the jersey color doesn’t match.
White helmet + red jersey + white pants how I’d prefer it over black helmet + red jersey + white pants.
For uniforms where the helmet color is a deeper/darker color (for instance, black over white), I prefer either to make the jersey color match the helmet color (navy blue helmet + navy blue jersey + white pants) or make the pants color match the helmet (navy blue helmet + orange jersey + navy blue pants).
I don’t know if this forum considers this miniscule, but I’ll try and see how this first post of mine goes.