Advantages      (Disadvantages)

Tricycle
Tailwheel
Nearly impossible to nose over
Less prone to damage – useful on unpaved surfaces
Easier to handle on the ground, significantly reduces ground looping
Wing sits at higher angle of attack, reducing takeoff distance
Easier to land as attitude is more nose down
Lighter weight
Less vulnerable to cross-winds
Less complexity if retractable
 
Less drag in a fixed gear configuration