Adrenal Glands on Termagants.
Pros: If they charge, they would do more damage against (let's say marines) than Toxin sacs, due to them being able to attack before the marines. combined with Toxin sacs however, you get to re-roll to wound and you will hit first on the charge.
Cons: AG doesn't do anything unless you are the one who charge.
Toxin sacs on Termagants.
Pros: Compared to AG, Toxin sacs works even if you didn't charge. Combined with AG you get re-rolls to wound you attack first.
Cons: none.
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Now, Termagants can be used in many different ways, but normally, I use them as cover/anti-assault screen units, that are able to hold objectives. Most of the time I will only need Toxin sacs, because If I charge him, my Termagants would most likely die and he would be able to assault something else during his turn regardless.
AG is good on units that is supposed to Assault quite a lot, like the Trygon. Being I5 on the charge is priceless.
Normally, I just use to by both upgrades to my Tervigon so it can buff them in that way. So that even if they Assault my screen and kill it, I will be able to assault with the rest of my Termagants, but only if they are supported by another friendly CC unit. Unless you want to be forced to be taking a lot of Fearless saves on the Termagants.
As for the Stealers I would take Toxin sacs instead of Adrenal glands. Why? Because Genestealers already have a very good initiative, and you would much rather have re-rolls to hit than wounding on 3+ against marines, because you get a good chance of rending a lot more.
But how many Termagants do the hormagaunt, Termagant and the stealer broods consist of?
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oh, btw, Hormagaunts and Genestealers can actually be a very good combination. For an instance in a list where you play with a lot of stealers and you feel like it might be a good idea to outflank them. If you then have a Hive tyrant with hive commander, you are then able to both outflank the stealers and the Hormagaunts. The Hormagaunts can then provide a good cover save for your Genestealers. Also, the Hormagaunts use to run faster than stealers with their bounding leap, so in that way, it shouldn't slow down the stealers too much.
Just food for thought.
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