Yea, I meant the ambush camouflage. The only reason why I'd prefer it over stormtroopers is because it fits much more into the doctrine. The doctrine's main focus is to buff your infantry and units. Stormtroopers in this game are meh at best, and really belong in the Encirclement doctrine, not the Elite Troops doctrine. Right now, there's no reason why you would go stormtroopers over panzergrenadiers in the Elite Troops doctrine, but for the Encirclement doctrine, you would at least have a reason (to cut supply lines leading up to close the pocket). Also, quick correction: The combo is only in one other commander.
The reasons are low reinforcement cost, extra abilities, and customizability. In elite infantry doctrine, You can get a schreck and G43s.
Also, I've heard rumors of there being different G43 stats for Pgrens. If true, do the stormtroopers use the normal G43 or the Pgren one?