BY and large, the car is faster. But no so much faster that it really would make a whole lot of difference (if speed is your ONLY concern).
In all the times we've gone and driven our car, we never had to wait more than a minute or two for a tram, and have always been able to get on the first one that came by.
With a bus you usually have to wait unless your timing is perfect. And there is always the chance that you won't be able to sit down on the bus--having to stand the entire trip.
PLUs--should you suddenly decide you want to play some miniature golf, head to DD for a little shopping, etc, a car is much more convenient.