Using the same method in SteveZaer's Scavenger Optimization Guide
http://www.mmo-champion.com/threads/...mization-Guide
I have created a guideline on which are the best follower abilities to get when recruiting for Treasure Hunter trait.
I have taken 4 scenarios, these include whether you are horde or alliance (because they have different level 90-91 missions), and whether you have the Level 3 Lunarfall Inn/Frostwolf Tavern (because they spawn the treasure hunter missions).
When calculating rare missions, I did not include any rare 90-94 missions since in my experience I have never seen them spawn frequently enough to take into account. I also excluded the highmaul/blackrock foundry mythic + 1000g raid missions, since I don't expect many people to be able to spawn those missions.
For almost every case, I would pick Wild Aggression, Powerful Spell, and Massive Strike
If you are Alliance, and you don't have the Level 3 Inn/Tavern, I would pick Wild Aggression, Powerful Spell, and Minion Swarms.
for the complete math and rankings, you can find this document: http://docs.google.com/spreadsheets/...KNCO_derkMLw0/ (look at the bottom of the document for rankings)
The math might not be the most accurate, but it gives a pretty good idea of what to aim for.
(since I can't post proper links yet, this will have to do)
Credit to SteveZaer for providing a template and method to work with.