Your question is magnificently broad. The outstanding review of the searches by Qian and Vogel 2015 covers all bases and all dozen experiments and alternate pathways/techniques.
They combine all extant data from all experiments, and not one narrow gimmick which you might be seeking. But I have no sense of the schedules and luck involved in getting there first.
Listening to people around me, they appear to think that by 2020 we'll know for sure from NOνA,
but I'm not sure this is not geographical bias.
PS. Purists insist on calling this 123 vs 312 option choice the "Mass ordering" issue rather than "Mass hierarchy", but I'll be damned if I know why... (I may be at a linguistic disadvantage, there. They predicate "hierarchy" on the value of the lightest neutrino mass.)