For 280 pts I can take 2x Exorcists w/dozer blades (better hide in ruins and forests) or, for 264pts, I can take 3x Heavy Bolter Retributors (w/4 Heavy Bolters and a Sister Superior w/Storm Bolter).
In theory, I should be getting 7x 48” shots of STR 8 AP 1 with the two Exorcist tanks, but, despite the averages, I seem to get 2-3 shots instead of the 7 I should be getting from them.
On the other hand, with the three Heavy Bolter Retributors squad, I reliably get 36x 36” shots of STR 5 AP 4 and 6x 24” shots of STR 4 AP 5 shots with 1 or 2 teams getting Rending. Additionally, a couple of attacks will not likely even take out an entire squad in cover (even if they’re hit with a low AP blast weapon) whereas a couple of good hits could easy disable/destroy both Exorcists.
The Exorcists seem too unreliable to count on. They would be more agreeable if they fired 1d3+2 shots each turn instead of 1d6 shots. Too bad the designer didn’t see it that way (not to mention, it’s a ‘one hit wonder’ since it only takes a single weapon destroyed to nerf it useless).
So how do my other Sisters of Battle (all 1 dozen of you!) players like to make the best use of your Heavy Support slots?