It will depend on a few other things of course.

Using Valiant gives you 5% haste, so if you gear for extra Stp and 21% haste instead of your normal 26% haste build to hit the 5-hit (I think this is possible with Phorcy's iirc) and you're just getting war and drk rolls from cor, then go for STR/TP Bonus Atmacites.

If you're not getting a 5-hit anyway, I'd suggest getting a 5-hit either by using Coercion for regain +3, Discipline for Save TP+20 so you don't need stp in ws gear, or Deluges for 15 Stp and 3 DA (also a good atma for upheaval).

If you go the TP Bonus route, that's another 3% haste you can drop from your gear allowing for more stp, so that might help with 5-hit too.

It's probably useful to level up a few of these in case you get a COR that is using different rolls (ie SAM) where you might want to go for a 4-hit (Discipline no good for this unless the COR is also doing save tp roll).

Personally, if you're going the TP Bonus route, I would only use Latitude, as Dark Designs offers nothing else apart from the TP bonus to you. This and the fact that with relic head +2 you get +70tp bonus for 50 seconds anyway, and during Blood rage an extra 20% for a minute (though this stacks, so up to you).