In all honesty, the light colour depends on personal choice and taste. Some people prefer a warm white light colour, while others prefer ‘daylight’ bright or universal white. Some lights, especially in vanity mirrors, have a colour change option, as do some wall mirrors.
There is no right or wrong. It all comes down to the type of light that makes cutting your toenails, plucking your eyebrows or trimming your beard easy peasy.