If you do that search I mentioned above read the 'Which is better Quattro or 4Matic' thread. I'd copy it into this message but I am computer challenged. You should have enough info to make a desicion after reading that one.
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (194,000)
1999 E300 Turbodiesel (244,000 miles, dies at 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles)
2011 Audi A4 Avant (129,000 miles) hate this car!
BMW 330 xi 6 speed manual (100,034 miles)