I live in Amsterdam and I agree that a subway system is probably faster and more efficient. However I find the street cars' ride more enjoyable. I don't like the idea of getting into the ground, with nothing to see from your window different than concrete. With the tram, you might take longer, but you can appreciate the beautiful city around you.

Also, stations for a subway systems requires more space, they're much harder to build and they're really expensive.

So I disagree with the idea that subways are superior in every way. Street cars have some advantages as well.