I played the last Twin Suns campaign as an Imperial using the Military Might deck. So because of that I had often both Stormtroopers and Heay Stormtroopers available to deploy.
It was often difficult to choose between the two. Stormtroopers gives 3 units for 6 threat (or 5 with Endless Ranks) and Heavy Stormtroopers cost the same but give 2 units. I often deployed a regular Stormtrooper group because I wanted the extra 2 dice. I had built my tactics to going close and personal attacking from close range for that extra surge icon. I liked getting the first Stormtrooper close, making him focused and attacking. Then the other two moving adjacent to him, firing and moving off so that they get a reroll.
With heavies...I don't know. They seem better from long range but I found that the rebels played in such a way that I could never get far enough from them and get a line of sight. They had Biv and Gaarkhan so they were often close. Heavy stormtroopers do have a better damage potential than regular ones but regular group has 1 more trooper.
I'm curious how people often choose between the two? Lets assume you're in a situation where you want to deploy more units to the map and have to choose between Stormtroopers and Heavy Stormtroopers.
And those were the regular guys as in the final missions I could deploy them, let them die and deploy them for the next turn again for 5 threat. It really aggravated the rebels and I won by wounding them. But what about the elites? Heavy Stormtrooper elites cost 8 (7) threat and Stormtrooper elites 9 (8) threat. Is the choice easier between these two? Of course there are Royal Guards and other awesome stuff for 8-9 threat but if you have to make the choice between Heavy and regular Stormtroopers elites. Which one would you choose to deploy?