I myself would have to go for GTA, not taking anything away from main or the current classic but GTA seemed to be the most entertaining and had the most things to do instead of just PKing. Remember the Civil war thing you started minoc? like prolly 2000 or 2001? between north and south, good times
Also the bowling Tyhm made was fun, there were a crapload of quests, GTA was the most in depth server of the 3 by far