>>117104628I haven't played VC, but SA and IV are my two favorite video games.
SA has more variety and craziness, and is easier to get used to. The shooting controls are kind of bad, though, and the graphics suck by today's standards.
GTAIV has a better story, the shooting is better, and the driving feels heavier and more realistic. It's hard to get used to, but fun once you do. The game is more repetitive, but I thought basic things like running over people was more satisfying than in SA.