From my experience a franchise provides better service because of the goals set by the parent company than an independent contractor would provide because there are minimum requirements set.
With the example of Post Haste there drivers are independent contractors and there is a lot of difference between the areas. Some are amazing and some could not care less what they do. With Fastway they may have a lower service quality in some areas but are more standard because of the limits put in place.
The above is my opinion that has been formed by having worked as an inderpendant contractor for a courier company and having a mother and father that were couriers for 15 years and worked for NZ couriers, Post Haste and Fastways (among others)