It's not so much the temperature but the CRI of whatever colour - you want the highest CRI you can find. However, ignoring that I go for 'daylight', which is about 5K. The 'cool' ones of 6K or higher are just too blue, particularly inside where there is no natural light, and the 'warm' ones of about 4K or lower are too yellow now. But it's very personal, and if you're not sure I'd suggest you grab a sample of each (warm, natural, cool) to try and see which you can put up with.