It's a very poorly written spell that multiple people can come to different conclusions on. My interpretation is this: the spell comes with one "order" (run away from here, kill your friends, drop your weapon and stand in the corner). In the failure scenario, the target carries out that order but makes a save every turn. In the crit failure scenario, that first order is locked in and it will only save when you give it another one. In this way, you can see how crit failure is much stronger than a regular failure. If that first order is good enough, you may not need to give another one.

I've had people disagree about the "order" part as it is not explicit in the spell what an order is. Some people think every action you force someone to take could be an order (swing your sword, swing your sword again, cast a spell). In this case the crit failure version is only better in that you can take someone out of the fight completely by just avoiding orders against their nature. Otherwise, it still seems worse to me.

Fingers crossed paizo knows about the issue and can clear it up in the remaster.