I would say Ariana (voted for Fifth Legends, let's not be naive). With the right promotion this era, I think Fifth Harmony will be everywhere. Maverick Management >>>>>>
However, if the 7/27 era smashes then who knows because Ari has really had only one successful era so far. Not that DW flopped, but for her standards it under performed.
I have a feeling Meghan's era will kind of flop after NO, but maybe I'll be wrong.
WFH also has had the least promotion in the US and is doing the best so