The point of the two different service plans, t&d and longlife is for mileage reasons. if you rack up a fair amount of miles then longlife is for you, as it saves you servicing your car every 10k..
on t&d the service light can come on early, if your doing short runs..
with longlife a service light indicates when its due, after sensors in the oil and etc detect it time to change..
with pre paid services the first service is abasic oil and filter change, theres no inspection done or anything, thats it, and vw finance will only pay the dealer for half a hour..