Most city buses spend most of their time going fairly slowly. The electric buses are absolutely a lot quieter, at least around here. Crucially, also, they don’t vibrate; I’ve never been on a diesel bus where vibration from the engine wasn’t at least somewhat noticeable.
On the older busses in the city I live in, the level of vibrations actually make me sooo motion sick, I have gotten off the bus and immediately evacuated my insides.
