I went Amber on the DRL LEDs because their white LEDs looked awful - I was disappointed in Sylvanias color temp selection (probably 6500 Kelvin when I was going for 3,000 ish). The ambers look great since it matches the turn signals.
A few years back I cleaned up the DRL sockets and installed 6000 degK ("daylight") LEDs, but I didn't think they were decently visible. I recently switched to amber LED and they seem to be more visible, easier to be seen.