Have played all of them since GTA3. But Vice City has some other place. The drug mafia of 80s, a psychotic protagonist with nickname 'The Harwood Butcher' and the atmosphere of Miami. While in GTA games you kill numerous enemies with a protagonist but it is not counted in storyline (in cutscenes you will always find other people treating you like you just killed some 2-3 thugs) but Vice City's Tommy Vercetti is shown to be a brutal killer with him appreciated for killing numerous people in starting,Diaz's killing and in killing of Italian mafia Kingpin Sonny Forelli. Also he becomes the most powerful criminal at the end of game compared to other protagonists.