WARM WHITE.
I mean, yeah, technically it's just personal preference. But let's face it. The so-called 'daylight' bulbs are nearly all better described as 'cool white,' 5000k or higher. 5000k is not daylight, it's blue. It's friggin' blue. It's a cold, lifeless, depressing blue, that looks nothing at all like warm, natural daylight.
I'll grant, I have experienced some 'daylight' LEDs that do their name justice (they're usually around 4500k) and actually output pure white light, that's actually a strong balanced white, and not blue. My new porch light is like that. If you open it up and look at it, you'll find it has half cool white and half warm white LEDs. But in general, LED lighting tends to fall to either cool or warm.
Also, what makes colors look better under the light has little to do with the color temperature, and everything to do with the color rendering index - CRI, which is usually listed on the box. Basically the higher the CRI, the more actual colors of the rainbow exist in the white light.
So I'll take the warm white. It's usually much more pleasing to the eye, it feels much more comfortable and inviting than a cold harsh cool white, especially for around the home. However, I will say one thing for cool white. I did a major remodel on my friend's living room, and he prefers cool white lights. While working I had incandescents lighting the room. He had me paint the walls this god-awful mustard yellow. It looked horrible. But when we put in the cool white LEDs, the blue muted the yellow so much that it was actually bearable and kind of balanced everything out. So that's something to consider.
I personally really like incandescent lights, but hey, the cost difference and longevity of LEDs is just too much incentive. In my kitchen, I have FOURTEEN recessed lights. At ll watts apiece, it takes only 154 watts to set the room ablaze with light. That's legit just 2 and a half 60 watts, which would pale in comparison.
Speaking of longevity, it really depends on the quality of the product, but I feel like they are getting better. LEDs do generate a lot of heat, for such a small source anyhow. Not to mention that they're usually up in the ceiling, the hottest part of the room already. And they have a pcb with capacitors and transistors and stuff that also don't like heat very much. Some of the older lights didn't have very good heat sinks to get rid of the heat, and they failed. My kitchen lights are the recessed retrofit type, and they keep going out. But the identical ones in my bathroom have survived the 5 or so years. I'd say the kitchen is too hot for them, but then the warranty replacements have shown me several different design changes, so I know the company has been improving them. Likely because of failures.