Among the many improvements featured in Star Wars Jedi: Survivor over its predecessor are Lightsaber Stances that give players more combat options to take down the many enemies that attempt to get in Cal Kestis' way. All five are quite different from one another, and they are effective in their own way, so picking one over another will not put you at any real disadvantage, especially if you are not playing at Jedi Master or Grand Jedi Master difficulty.
If you are trying to complete the game at high difficulty, however, you will want to equip the Lightsaber Stances that work best in all combat situations, providing the right amount of flexibility to take down common enemies, big groups, and bosses with ease.
With that out of the way, there's no denying that for Star Wars Jedi: Survivor players who are also veterans of the Souls series, the Crossguard Stance is one of the best to use. While the weapon is slow, and it locks players into animations so it's not possible to parry attacks while Cal is recovering from his swings, it is extremely powerful and has amazing range, so those who have mastered the combat system of the FromSoftware's popular action role-playing game will have very little trouble making this stance work great in all situations, even in ranged combat, thanks to the powerful Lightsaber throw which deals tons of damage. By spending Skill Points into the Stance's skill tree, it is also possible to speed up attacks, making this Stance even more deadly.
When the Crossguard Stance definitely feels lacking is when fighting larger groups of enemies in Star Wars Jedi: Survivor. The slow swings make it difficult to deal with faster enemies that like to gang up on Cal. The solution to this issue is to use either the Double-Bladed or the Dual Wield Stances, although I find the Dual Wield Stance to be slightly better in this regard, thanks to the ability to cancel attack animations into parry and guard, and the slightly higher damage output. The only instances where the Double-Bladed Stance is superior to the Dual Wield Stance is when facing shielded enemies or if you're parry game isn't very solid. If you are a parry master, then no other Stance is better than Dual Wield, as you can essentially be on the offensive at all times.