ATI of nVidia?

[WipeOut]

Hi,

Not wanting to start a war because I think either brand has a card that 
will have more performance than I will need on my Ubuntu based desktop.. 
The question is really related to compatibility and easy of use..

Of the two brands, generally, which is the easiest to get working in 
terms of drivers and which has the better feature set and support under 
Ubuntu?

Thanks..