Unity on a Dime - What is the Most Efficient Slot to Craft Unity?

wowhead.com:

With more players unlocking the Unity runecarving recipe, many are unsure which slot to craft their second legendary on. For those looking to not spend too much gold with recrafting or crafting multiple Unity slots, we've prepared a list of the most efficient slots for each class to craft Unity. As we discussed in our previous Unity post, every time you get an upgrade, there's a chance that your absolute best in slot would be to have Unity in a different slot, having Unity cover your worst non-legendary slot. However, that approach can be quite expensive, as legendary base materials can range up to a few hundred thousand gold each. The performance gain from this approach is also rarely high. In some extreme cases your character can be a couple % stronger, but it will usually be a small gain. With that in mind, we prepared, along with our Class Writers, a list of the most efficient slots to craft your Unity legendary on. These suggestions take in account many factors, like which slots are covered by your non-Unity legendary, which slots are hard to find well itemized gear, and so on. Note that none of the suggestions include tier slots, that's intentional. Since tier is rather scarse to the majority of players and many will still obtain higher item level tier in the future, those five slots are in constant flux for most players.

With that in mind, we prepared, along with our Class Writers, a list of the most efficient slots to craft your Unity legendary on. These suggestions take in account many factors, like which slots are covered by your non-Unity legendary, which slots are hard to find well itemized gear, and so on. Note that none of the suggestions include tier