The "next best" is pretty variable and based on conflicting priorities.

The safest in terms of "guaranteed to be BiS" is the ring. However, the ring does not give +Vit, which is a consideration.

The chest, gloves, and boots are all reasonable candidates for +Vit and "probably BiS". The issue is that the 480 acc BiS is different than the 470 and swaps pieces between those 3 slots. So if we need 480 or more for T7/8/9, then a "470 purchase" might not be BiS and you could be randomly annoyed later.

The helm and belt are poor candidates because it is unlikely they will be in any BiS set. (Sidenote: checked, helm is good for a no-Acc i110 set, but that's about it).


The last consideration, and the most complicated, is that the loot tables are not fully known for T6-9 yet. If a certain slot does not drop until T9 or maybe T8, then that becomes a more relevant priority for Soldiery Tomes.


So a generally safe strategy would be to pick up the leggings, then stockpile Soldiery until more accuracy and/or loot table information is confirmed.

Then, prioritize either the boots or gloves+chest depending on the acc, and prioritize the "T9 only" slots.

Within that pool, prioritize by left side > right side.

If you cap out Soldiery before the information is confirmed, pick up the ring.