It's so hard to decide which one is better, as they are both so bad... Just as a quick remark, Intel's graphics cards shouldn't be sold. They have 128 MB of RAM (compare, extremely low clock speed, and are just poor excuses for a graphics card.
In any case, I would go with NVidia. They are the world leaders in graphics cards. Truthfully, I don't get much of a boost with my Windows 7 desktop running Photoshop CS5 (I have a NVidia GeForce 9800GT, which was pretty top-of-the-line about a year or so ago). I personally use it for GPU computing, as it scales my processing power by a factor of 10. Adobe hasn't really done much in that field...
I wouldn't get too frustrated about this matter, as you would need an insane graphics card to really feel the difference with an application that doesn't seem to fully utilize the card itself. Truthfully, I would just build a nice desktop computer for $1,000 with adequate components to last you a decade, as constantly buying laptops is going to waste you tons of money, but that's a different topic ;)
As I said before, you shouldn't really care, as those cards aren't going to give you a noticeable performance boost with Photoshop. If you absolutely need GPU acceleration, get a decent card (I'm using a $150 GeForce 9800GT, originally purchased for gaming, but I retired from that).
I hope I rambled enough for you to see what I was getting at, as I have no writing skills whatsoever ;)