This is the favorite class not only for the most of players but for game makers too. Just look how strong they are and how many advantages they have.
Armors. Trojan armor itself has highest physical defense. It has low magic defense but not as low as warriors. Coronets is invisible same as earrings. You can see your cool haircut unlike using helms, hat, or caps :).
Weapons. After lvl 40 (that is very easy to reach) Trojans can use 2 weapons. Even if second weapon don't give as much attack but it also gives dexterity too and also good place for another 2 gems. Using 2 handed with a tro is a waste of time so if you like them its not good for you. You can also choose to use attack or heavy ring. You have good attack anyway so can choose heavy ring for more accuracy.
Skills. Trojan XP skill cyclone far away from warrior's skill superman. It does help when lvling but its excellent for pking. You can hit your opponent twice in a blink of an eye. XP skill robot-- I don't really know its usage. But it has enormous HP so it probably wont get killed. Trojans can heal themselves. So they don't need as much pots as warriors would. When using both weapons of the same type they can use skill Hercules that helps when fighting non melee fighters. As they have 2 weapons they are more likely to have scent sword or fast blade than warriors.
Attributes. Trojans has high vitality that gives them very high HP. Unlike warriors strength its good thing to have.
PVP. Trojans are excellent pvpers. They high attack allows them to kill not only most of archers and taos in 1 hit, but they also may kill weaker warrior in 1 hit. With skill cyclone they are so fast they can hit 2 hits before opponent understands what is going on. With their high HP they can stand for long against archers and taos so have more chances to get them. If u surprise attack tao or archer he is done (when comparing classes I always consider them to be similar lvl with similar quality of equipment).
So Trojans: High ph-def low m-def. High HP, high attack, excellent attackers and good for fair fight. Not as easy to lvl.
Trojans will be good for you if you want to be strong and fight much. But it's not as easy to play as warrior is.