Hmmmm, not sure which I like better (HK vs Singapore). Would like to hear more about Taipei's. Don't really have enough experience with any to do a thorough comparison. Anyone want to step up? These would be my comparison variables, off the cuff:
- ease of accessing airport
- comfort & safety
- clear design, ease of use
- stops in most areas usually visited
- stops not too far apart
- broad service hours
- service frequency