Signal Priority only works well if the arrival time of the bus can be predicted some time before arrival at the signal (~30 seconds is a number I've heard a few times). As bus stopping times are highly unpredictable, a lower number of bus stops makes signal priority work much better (and far-side bus stops).
Furthermore signal priority and own lanes are almost always beaten by good circulation planning, reducing the number of traffic lights and cars on the route of the bus.
Furthermore signal priority and own lanes are almost always beaten by good circulation planning, reducing the number of traffic lights and cars on the route of the bus.