Battle Sisters are your only Troops choice. Seriously, the section is empty apart from this squad. Luckily, they are not a bad choice. They may take a special weapon, heavy weapon or further special weapon and equipment on either the Sister Superior or Veteran Sister Superior, depending on which you choose to take. This means that you can load up a squad with more weaponry than sense as you may take a squad of five Sisters with two flamers, or a heavy flamer and a flamer, or a multi-melta and a meltagun! The Simulacrum Imperialis and the heavy flamer have both halved in cost, though the heavy bolter has been brought up to the same cost as the other codices. This means that many different types of weapon load-outs can be used. Firstly, there is the simple ‘sit on objective’ squad. This consists of 5 Sisters, one heavy bolter and an optional Simulacrum Imperialis. It is incredibly cheap, gives you a Ballistic Skill 4 heavy bolter and has a 3+ Armour Save to just sit on an objective in your deployment zone. There is also the spam type squads, again consisting of 5 Sisters but this time with one of two choices. Either giving your squad a heavy flamer, a flamer, a Simulacrum, a combi-flamer on the Sister Superior if you feel so inclined and putting them in an Immolator with twin-linked heavy flamers. This is a 145 or 155 point unit, depending on whether or not you go with a combi-flamer as well, with a ridiculous number of template weapons. You can also do the same, but replace all mentions of flamer with melta and you have a ludicrous number of anti-vehicle in one squad. Being an Eldar player as well, I find that specialisation serves better than generalisation, so potentially a mix of the types would work. I have yet to try this tactic out myself as I would need more Immolators, but I could see it being fun to field. There is also the potential to take up to 20 Battle Sisters in a single squad, though I believe that they lose effectiveness past 10. It is best to take two squads of 10 Sisters than a single squad of 20, as there is a lot more flexibility without giving away too many kill points, and it gives you more access to heavy and special weapons. I believe that Battle Sisters benefit greatly from Dedicated Transports, depending on their squad size. Their faith power is mediocre, though it actually has some use. For a single shooting or assault phase, you can give your Sisters the Preferred Enemy special rule, allowing you to re-roll 1s To Hit and To Wound. Useful, but nothing to write home about. I would advise taking a Simulacrum in these units as re-rolls of any kind are always welcomed, but it all comes down to whether or not you can fit it into your list.
On the topic of dedicated transports, we have the Rhino and the Immolator. The former is near-identical to the Space Marine equivalent, having the same armour value, same hull points, same equipment and the Repair special rule. Where it differs is in the fact that it can take from the Adepta Sororitas Vehicle Equipment list, allowing for such things as Laud Hailers, which grant re-rolls to Act of Faith leadership checks, a very useful boon as it means that, on Leadership 8+, you will almost definitely manage to get your Acts of Faith off when you want. It is also 5 points more expensive, but sports the Shield of Faith special rule. 5+ Deny the Witch, which I am not even sure works as I have yet to see a psychic power target a vehicle, and a 6+ invulnerable save. Nothing to rely on, but it could just save you from that lascannon penetrating hit and cause your opponent to reconsider his or her faith in whatever heretical power they believe in. Surely, the Emperor protects!
The Immolator, on the other hand, is what would happen if the Adepta Sororitas got a Razorback. Again, same armour, same hull points, same transport capacity, same Ballistic Skill, but 5 points more expensive for the Shield of Faith special rule and able to take from the Adepta Sororitas Vehicle Equipment list. However, it also largely changes in weapon options. Being of the Adepta Sororitas, your weapon options are either a twin-linked heavy bolter, much like the Space Marines, or the choice of a twin-linked heavy flamer or twin-linked multi-melta, neither of which will cost you any points. For me, this is wonderful as it means that I can put multi-meltas on them and have relentless, twin-linked multi-meltas. As long as they do not get shot, an Immolator can dish out a lot of pain, depending on how it is outfitted. Heavy flamers often spell its demise if not supported, as most units have krak grenade equivalents or at least Strength 4 in melee. Multi-meltas give some nice, short ranged anti-vehicle firepower on a fragile frame. Heavy bolters give some decent range, but lack the sheer amount of stopping power as the other two options; the Adepta Sororitas excel at short range firefights, so in my opinion that is where they should concentrate their efforts.
The Adepta Sororitas Dedicated Transport from Forge World, the Repressor is a very, very nice addition to a unit. Firstly, it has a lot more Fire Points than any other Dedicated Transport option for the Sisters (3 on each side and two from the top hatch for a total of 8!), making it the perfect “drive-by” vehicle, allowing you to drive past a unit and unleash all manner of bolter, flamer and melta fury from inside its Front Armour 13, Side Armour 11 chassis. It bears a heavy flamer and a storm bolter for its own defenses and comes with a dozer blade included in its points cost, meaning that it will rarely get immobilised moving through terrain. All of this comes at a modest points cost, however I do not field them. They cannot take Laud Hailers. This is a massive drawback for me as I will take Laud Hailers on all of my vehicles in an Adepta Sororitas army to allow me to re-roll all of my Act of Faith tests as long as my units are near my vehicles, which they often are. As the Act of Faith special rule is so important to most Adepta Sororitas units, this is reason enough for me to not take the Repressor.Also, the Rhino and Immolator feel more like an Adepta Sororitas vehicle where the Repressor feels like an Adeptus Arbites vehicle. I love the whole Ecclesiarchal Sisters of Battle feel to my army, so this is just another drawback which pulls it behind the competing Immolator and Rhino Dedicated Transports. It’s not a bad unit, but it just does not fit with my army, so I often do not take them. I would not advise totally discounting them though, as the unit itself is not bad. I would still be tempted to take one for a Dominion squad for drive-by meltagun antics.