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TSW is horror-based with puzzling quests and helpful community. 3 factions. Skill points instead of levels and classes, which make more class options.
GW2 is B2P and fantasy-based with dynamic events and looking at Arenanet's background they release a lot of expansions. PvP is also dynamic where you can destroy parts of a building, etc...
What does WoW have? An old engine that's not been upgraded to fit an evolving MMORPG genre. If only TSW and GW2 could merge, we would totally see what the MMORPG (themepark) next step evolution really is about.
No wonder Vivendi wants to sell Blizzard. Blizzard really isn't a MMORPG company like Funcom and Arenanet, they are Jack of all Trades.