Intel HD 4000/5000 vs Nvidia ION 2

Hello,

I plan to buy my first HTPC to get XBMC. After some researches, I wonder which GPU chipset is best suitable to run XBMC under Linux (I can also get windows but Linux is preferred).

I've saw that there's some issues with Intel linux drivers, whereas Nvidia drivers seem to be very stable for Linux.

Can I get your experiences for both platforms ?

Thanks a lot,
Aixki