If you have the cash get a x5 m if you don't get the x3 35i.
I have a e30 m3 and my 2006 x3 I like the look of it but wish it had that 335i turbo motor in it!
I put on some sick AC Schnitzer 19" wheels and like to do exhaust and chip.
The X3 handles great 50/50 weight distribution .
If it is size you want than I don't think either are very large or roomy.
The Audi has some nice looking large suv out.
I'm more into bmw though their is some nice Audi's out .