It is my understanding that in tournament play, where each unit must be useful against a range of opponents, this forum - or at least the most experienced members, rule that Dominions do not cut it as a four-flamer-Immolator squad.
A typical rejected build is something like:
6x Dominion, @186/196
4xFlamer,
VSS w/book and/or combi flamer
Immolator w/ heavy flamer
Although this is an excellent unit against hordes the unit does not cut it, IMO, against any MEQs or TEQs because of the difficulty of using Divine Guidance with such a small squad.
Sure, the squad will kill a few marines, but a BS Squad will kill more, due to a much better chance of using Divine Guidance. To get DG reliably either a Litanies Canoness is required, or an expensive, and still not very reliable, Imagifier.
However, now I come to '
the interesting wrinkle'. With the Imperial Armour 2 Update pdf., SofB rhinos are reduced by 15 points, and include smoke launchers and storm bolter (+searchlight) as mandatory - basically at the level of the new Smurfs.
Now I feel, by losing the heavy flamer of the Immolator (the only real difference) but taking an updated SofB rhino you save 30 points (30+ if the Immolator had upgrades).
For a similar price, but a loss of a heavy flamer, a typical loadout can now be.
9 x Dominion @189/199
4x Flamer
VSS w/book and/or combi-flamer
IA 2 rhino
With vastly increased numbers this squad is more resilient, no longer relying on SofTM to keep it alive after the first 'jump-out and flame' and has an almost equal chance to a BSS squad to use Divine Guidance but w/ a max of 5 rather than 2/3 flamer templates. This unit IMO, is much more dangerous against a range of foes a potentially very damaging for hordes and MEQs/TEQs alike (imagine a 20 man BT Crusader squad being flamed by 5 rending templates!).
Sure it isn't a troop choice as opposed to a BSS but I mean 4 flamers in the right place...
I apologise if your LGS will not allow you to use the IA2 update - bringing sisters to the same level of rhino-cost as Smurfs - this wrinkle will not be applicable but for those that can, hope this helps, or spawns some lively discussion at least.
C and C welcome.This is all a kind of Eureka moment
so if there is a blatant flaw please tell.
/CF
Edit, here's a linkie to the IA2 update
http://www.forgeworld.co.uk/pdf/ia2-update.pdf - Check pages 14-16