Up until recently, I've been rolling Multistrike primary Mastery secondary, both because most my sims shows those to be best, and also because Multi/Mastery fit tanking as well, allowing for a good split without changing much gear.
That said, both AMR and SimCraft are showing me Multi/Haste is the way to go by a decent amount. I'm under the impression AMR is meh sometimes, and Sims are debateable right now. Should I stick with Multi/Mastery or switch to Multi/Haste?