Illidan is one of the best characters in the game. Saurfang is a good character but he's doing weird stuff in BFA even going as far as deliberately losing bases because "honor" and forcing culture on his superior and somehow if she doesn't follow that culture she's going to get killed by the Horde and Alliance.
Turalyon is as interesting as paint drying on the wall. When he was about to kill Illidan he was easily persuaded by Velen in the matter of five seconds which broke his character. He did nothing in Argus really that made him flavorful or vengeful, character broken again. In Antorus he asks champions to bring down the boss instead of fighting with us like the character he is, character shattered. He's also a Human leading Draenei. WTF?? Even if the LF leader died another Draenei would take his place not a fuckin' Human.