I know people hate on Pandaren (and I think that expansion was definitely overbearing with them), but generally speaking I actually think they're a cool enough race. Enough so that I actually bothered leveling one back in MoP (as a Monk, obviously).
But looking back, I kind of wonder which faction is "more canon" for them?
Obviously, they canonically exist in both factions. But in terms of story, culture, and overall "feel", I think it's interesting to consider which "makes more sense" from a Lore perspective?
On one hand, for *whatever* reason, Blizzard has retconned the Horde to value individual cultures a little more. They're certainly the more primitive and spiritual of the two factions, so there's a compelling reason a Pandaren might be more inclined to side with the Horde.
However, if you look at the state of the Horde during the time of MoP, it was anything *but* inviting. Garrosh went full-blown insane villain, and in Siege of Orgrimmar, we even saw Ji Firepaw being tortured. If you look at that from a storytelling perspective, it basically tells the story that Ji Firepaw chose to trust the Horde despite the warnings of his peers, and they wound up being guilty of everything they were accused of. Thematically, it's a story that basically says "don't trust outsiders, because they'll harm and exploit you". Also, the Horde have far more in common with the Mogu than the Pandaren; the former sees conflict as an inevitability and opportunity to test oneself, whereas the latter believe conflict to be a last-resort and the result of imbalance.
By contrast, the Alliance has virtually *zero* connection to the Pandaren, in any way whatsoever. The Alliance doesn't appear to particularly value the Pandaren, they just sort of... *exist*.
The one other potentially-relevant factor being the two other races that join the Horde vs. Alliance conflict: the Jinyu and the Hozen.
I'll go on record saying I despise both of these races. But at the very least, the Hozen seem good for a laugh, whereas I personally find the Jinyu to be damn-near insufferable. It probably doesn't help that as an Alliance player, your introduction to them has you power-leveling a bunch of random Jinyu, to which I simply ask "why the fuck are you guys prepared for ANY sort of conflict?!" (I never did the Horde side quests, so unsure how this compares).
All in all... I would probably say that "canonically", a Pandaren would probably be *more* likely to join the Horde.
But I'm curious what you guys think? What's your perspective?