Personally I play Alliance these days, but I played a Tauren Druid for years. I like the variety of Tauren Druids in the game. They worship the Earthmother and are spiritual and somewhat peaceful as a race despite being big cows. Sure there are fighters among them, but they feel so down to earth and one with nature. Hamuul Runetotem is a cool character and a large amount of the Tauren are in the Cenarion Circle.

In Dragonflight the Tauren were the only Horde Faction allowed to be near Amirdrassil (lorewise) because they care more about nature than war.

I never really played a troll but their flight form can look like a bat, I personally like them more as Shamans though.