As a pure AWD I think Subie's is the best. You can run that thing without electronic controls since it has a viscus center diff. Also, with the front diff intergrated into the trans so you can have equal length front CV's, well, the thing is a work of simplicity in engineering. Whole drivetrain is a work of art if you ask me. Course I wouldn't want to do anything "hard" with it, but it is perfect for dirt roads and the street.