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Hey, another person from Salem (that's where I am as I write this)!
The electric will be more fuel efficient, especially in our climate where we rarely need the fan. How much more efficient I'm not sure. You'll want to leave the fan control up to the vehicle electronics to switch on. It's too easy to miss an alarm that warns when the fan needs to be manually operated, especially that one time you let someone else drive the car.
I recall my friend's VW had 2 fans, just like most Japanese cars. 1 fan turns on whenever the AC is operated, and the other turns on only when the coolant temperature goes above a set threshold (215 F in my Acura). How many fans are in your Passat?
I've found that my cooling fan never turns on when I run the AC, as the airflow from the AC fan is sufficient to keep coolant temperatures in the normal range.
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