Your normal average passenger would typically choose the quickest - and most convenient (remember that!) - way to their destination.

I could hop onto the 35 from the west end of Ashington to Morpeth at xx:10, get the xx:28 X18 to Newcastle, getting me there at xx:01. Your average punter doesn't and takes the less complex route of waiting a couple of minutes for the X22 and getting into Newcastle at xx:08.