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Personally, I feel you get what you pay for....no matter what it is. In that regard, the Philips will give you better visibility along with the 6K color. I purchased my bulbs through Nigel's group buy and couldn't be happier.
Take a look at the Xtreme D4S 5000k HID bulbs if you are looking for more color than stock without compromising too much light output. Keep in mind that as you go higher in color temperature you start to lose useable light output. Here are some great comparison shots between the stock 4100k D4S HID bulbs and the Xtreme D4S 5000k HID bulbs: