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AWD gives you a much better launch, and therefore a better 0-60 time. (if traction at the launch is a limiting factor) But it also introduces more weight and drivetrain loss, which shows up as lower trap speed.
As for the 328i being faster than the 328xi, it's probably because lauching a 3300lbs car with a naturally aspirated motor making 200ft-lbs of torque is really not traction limited. But once you get to the 300ft-lbs 335i, it's a different story.
AWD is always a good companion for the non-linear and somewhat unpredictable/explosive power delivery of traditional turbos. Now the 335i is all fancy with supposedly NA V8 like power delivery, so adding the heavy and complicated X-drive may not be very necessary.
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