Both the Boeings and the Bredas have the same step format. (Not sure whether made by the same subcontractor) The floor just inside the door has two vertically moving strips, the outermost drops down about 20 inches and the other drops down about 10 inches to form the stepwell.
On the Breda cars, when the steps are in the up position making a level floor, there is a gap filler, a much narrower strip that comes out from under the outermost step-strip and snaps into place level with the floor when the door opens.
Only the steps "on the right" could be lowered and on the Boeings, the doors "on the left" could not be opened when the steps were lowered. (San Francisco's as well as most cities' earlier streetcars didn't use left side boarding.) The latter restriction may have been removed and the Bredas don't have this restriction so as to allow alternating service of island high platforms and regular street stops without adjusting the steps.
The quality of the ride is more dependent on the travel path as opposed to the kind of vehicle or the kind of energy propelling it.