The all-wheel drive sytem on the 335i xdrive chugs more fuel, but would be better if your streets are less tarmac than mud or snow. Unless you live in an area with unpredictable weather, the 335i base variant is the more practical choice out of the two.
2017 BMW 5 Series Gran Turismo Hatchback Prices
550i xDrive 4dr Hatchback AWD (4.4L 8cyl Turbo 8A)
|Engine: V8||Transmission: 7A|
|DriveTrain: AWD||MPG(city/highway/combined): (15/24/18)|