Which World of Warcraft expansion is your favourite, Burning Crusade, Wrath of the Lich King, Cataclysm, Mists of Pandaria, Warlords of Draenor or Legion?

Wow, there are sure are a lot of expansions. Sure doesn't feel like a lot until you type all of that out :p

I think I'd have to say my favourite is a toss up between BC and WOTLK. I started playing WoW right when BC was released so there is a lot of nostalgia there but Wrath was a lot of fun and I loved the Viking inspiration.