Blave |
It's not better or worse, just different.
Pros: Targets Reflex instead of Fortitude. Inflicts a -2 attack penalty on top of off-guard, so at least martial enemies are likely to waste an action standing up, which also trigger Reactive Strike and similar abilities.
Cons: Doesn't grapple. Immobilize is a harsh condition and getting rid of it doesn't only take an action (unlike prone) but will also affect the enemy's MAP. Grapple also potentially screws spellcasters.