Facts are better than opinions, and here are some facts:
Rail has been proven more powerful in getting people to leave cars at home and use public transit than buses in similar situations, even where schedules, running time, and convenience are similar.
Rail vehicles are generally more roomy than buses, simply because they are guided mechanically and don’t reuqire operator attention with regard to direction of travel. There are long articulated buses, but in width and height they are generlly smaller than railcars. In a given lane, a guided vehicle requires less safety space on each side than one driven manually.
When General Motors converted the Lexington Avenue NYC route of Green Lines (New York Railways, a subsidiary of Firth Avenue Coach Company, which was a GM Subsidiary), business picked up immediately on the directly parallel Third and Amsterdam Avenue line of Third Avenue Railways. When TARS, then became TATS, Third Avenue Transit System, and New York’s government forced conversion of the Broadway-42nd Street line, one of the busiest streetcar lines in North America, to bus in December 1946, about 1/3 the passengers left! Some used the subways, some used buses that were more convenient since there wasn’t an incentive to walk an extra block to use streetcar anymore, and some (like me) just walked!
Although massive amounts of money are required for light rail installation (but far less than either a real subway system or monorail), operating costs usually are less on a per passenger basis than bus operation, because one operator handles more passengers in a given vehicle.
There is one kind of bus operation that people find as much fun to ride as a train or a streetcar: An open top double-deck bus in the summertime.
Finally:
People per hour one lane past one point at reasonable speed:
Private auto:2500 Bus: 7,500 Streetcar: 12.000 Light Rail Separate RofW: 20,000 Heavy Rai