14 Epic followers + 11 Rare Followers are currently active in my Garrison. Don't ask why or how I just completely lucked out this expansion for some strange reason.
I have 3 Scavangers so no more of them, the lowest Counter trait I have is Magic Debuff so the question is:
Should I recruit a 3rd Magic Debuff follower OR High Stamina OR Epic Mount ?
Check the wowhead link in it: it tells you what you need to counter the four High Maul missons. You may find a gap you can try to rectify, although given that you need TWO counters on each follower on each mission, the inn is not a guaranteed solution.
I agree that high stamina is a good one - may be pick that trait and use the wowhead link to decide between the 3 offers?
Epic mount imo. There's still roughly a 1/3 chance that you can pick an epic mount follower with magic debuff. There are a lot more traits so getting specific ones is harder than specific counters. Even if none of the 3 have magic debuff, make sure you pick a spec that can proc it when you train them to epic. A frost dk for example can only have 5 counters, let's say there is one with an interrupt, then you have 1/4 chance of getting AMS when he turns epic. I'd say overall rough chance of getting a magic debuff (eventually) if you recruit for epic mount is 40-60%. Fwiw the specs that can have magic debuff counter are: frost dk, resto druid, mistweaver, holy/prot pala, any priest, resto shaman and affliction warlock. All of them got 5 possible counters, so 25% chance on any of those to proc it when they turn epic if they wouldn't have it yet when recruited.