Druids are sworn to remain neutral in faction conflicts. It actually makes little game sense for druids to participate in any of the AvH conflicts. Plus night elf druids outnumber tauren/troll. A druid's final loyalty lies with nature, not faction. The main people you'd be looking to for support from Val'Sharah are the worgen and human settlements, not the druid. They'll easily align with the alliance.
Azsuna would likely not take sides quickly, but Farondis is heavily opposed to the Nightborne Elves, so he'd end up choosing the Alliance almost for that reason alone.
Highmountain belongs to the Tauren, so that will go Horde.
Suramar belongs to the Nightborne, so Horde.
Stormheim belongs primary to Odyn, who will likely remain neutral, possibly leaning alliance especially after Sylvanas attempted to imprison his Val'kyr.
But remember the alliance will also pick up the Dark Iron Dwarves, so all the resources of Blackrock, the Burning Steppes, and the Searing Gorge are at the their disposal.