If GTA III had kept having more missions like the mob missions for the Leones, then with out a doubt my favorite would be absolutely GTA III. But sure enough, those missions ended soon and it got boring. Therefore I like Vice City the most. Overall, the missions are much better, the landscape is much nicer, the characters are much cooler, and the vehicles are much original. The addition of motorcycles and flying vehicles clinch my oppinion of Vice City being the best.