Arroyo is a superior player to Robinson. Most Orlando fans will tell you Arroyo has been the best PG in Orlando. Arroyo has the best CHEMISTRY with the starters and the team plays best when Arroyo and Hedo are running the show.
More experience and maturity, Arroyo has as much talent if not more than Robinson, dunking a basketball isn't really "talent", Arroyo is really one of the most flashiest PG's in the NBA, which is the reason why he doesn't start.
Arroyo can play PG affectively with his court vision and passing skills, Robinson and Collins cannot play the PG and are really OFF GUARDS, you can't really on those guys to run an offense affectively like Arroyo can.
You don't watch Arroyo much, at best two games. Arroyo is an average defender. He doesn't shut anyone down, but he stays in front of his man and has good footwork.
Arroyo is a C+ level player, Robinson is C, Collins is C-.