It's pretty easy to differentiate between GTA and Bully. Both are pretty fun but...
Now, the GTA San Andreas vs Bully comparison: I've heard alot of comparisons lately and I'm willing to give my opinion. Some gamers think that killing people makes a game more fun, but I disagree. GTA SA offers that but that shows the game to be too violent. You can't kill anyone in Bullworth because lets face it, your'e still a kid! When we compare maps we find that GTA SA offers a much bigger map than Bully, you can drive any car you want including lots of planes and motor bikes, and war machines. There are many things to discover and LOADS of things to do in SA unlike Bully. You also feel FREE in SA, go and do whatever you want whatever the time. But in Bully, you have to obey the rules and go to class in the morning and evening classes. If you get cought not in class, after curfew hours, or outside the campus, you'll immediately get chased and forced to your class or dormitory. So you're pretty much running away from cops and prefects in the game most of the time, unlike SA where you only get chased by the cops if you exaggerate with the killing and stealing. In SA you can learn new moves and build up your muscles, where in Bully you can only learn new moves. If we can sum things up we realize that GTA SA offers much much much more than Bully when it comes to free-roam. But if we look at it without seeing a video game, isn't that what teenage trouble makers have to face in real life? It's a good thing that his mother and step-father are on their honeymoon or else we could have been chased by them too!
To sum things up, both games are pretty fun and offer the addictiveness for continuous game-play. But GTA will always outrun BWA when it comes to complete freedom...