One advantage of rubber tired system is their ability to climb hills, and also to provide a better acceleration using a smaller number of drive units.
An advantage that is sadly hardly ever used on the systems that chose to adopt the technology.
I understand that on the Paris metro for example, rubber tires were adopted on certain lines because they permit faster acceleration and braking, meaning more trains can run at shorter headways , meaning the overall passenger capacity is increased. At peak times you can sometimes see trains running almost literally head to tail, with a fresh train running into a station mere seconds after the previous one has pulled out.
This argument, however, does not apply to most systems that adopted the idea.