Strategy wise, it seems as though there is a big advantage to fielding 6 (max) troop units that comes into play with orders. Your command card orders let you assign orders to specific types of units, not specific units. That means you can play an order card that gives your commander an order and maybe one other that you give to a troop unit, but when it comes time to activate you have multiple options of which unit to activate with that order. Then after that, when you pull random orders you have a high probability of pulling a troop token from the bag--which you can then use to assess the battlefield and activate the unit that makes the most sense.
Lots of troops=lots of battlefield flexibility. The main downside is those scary comments about fielding two AT-STs or two T-47s. Troops will have an advantage for objectives, but they will have a hard time staying alive!