Warm white or Cool White Led bulb?
Colour temperature in lighting describes how the colour of the light appears from a lamp, measured in kelvins (K).

If you like the traditional yellowish color of a conventional lamp then warm white around (2900-3300K) would be the ideal choice, this is the most popular choice for homes.
If you want a modern, clean look, you may prefer the cleaner, brighter feel of a cool white lamp (5500-6500K).

Basically the higher the colour temperature of LED bulb, the "cooler" a lamp will look.
Choosing a right colour will set the mood of your space. You can choose warm white colour of Led bulb for living room, bedroom or hallway and cool white will work out well in kitchen, study, bathroom, office, retail etc. You can also mix and match.