Most US cities are doing trams for tourist purposes not transport. The bus is better than a tram in almost all cases, it doesn't need track maintenance ,can go around obstacles, can change routes quickly if you didn't get it perfect in advance.

The disadvantage of a bus is they can hold 1)at most 100 people, and can't come more often than every 5 minutes. If you are running into that limit a tram might be right for you. (Even then think carefully , a subway might be better)