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Do you have any experience with busses? Was that experience "great"? For example, have you lived in Hong Kong, which I understand is a Bus city? I live in Prague, and the trams are great. It is a 100% better experience than driving. Smooth, quiet, usually plenty of leg room. Doesn't smell. The busses, however, are hell. That low key vibration of the motor, the smell of the gass, the cramped spaces, the steps, all add…
I've had some good bus experiences, in Mexico City and KunMing I've ridden in nice clean busses with dedicated lanes and raised platforms for easy entry/exit[1]. It's near as nice as rail and from what I understand quite a bit cheaper to build [1] https://en.wikipedia.org/wiki/File:Estaci%C3%B3n_SetDomingue...
In any case, over time the price of the busses goes up steeply. You need to replace a bus after 20 years, where-as trams last 50-60 years. Prague is replacing their Tatra T3 [1] trams from the 60s, not because they are worn out (they still run like new) but because they are more dangerous in accidents for the driver (they have no crumple zone and worse brakes) and because they don't have wheel chair access. Other, poorer cities have even older trams that still run fine. When they upgrade, those old machines aren't scrapped, but are sold to more eastern ex-soviet contries as working vehicles and actually put into service there. When was the last time you road in a 50 year old bus?