Unless you live under a rock I am sure your all aware of these 2 massive projects coming in the near future and this debate is a pretty popular one among social media and gaming sites right now, heres my 2 cents.
Eso > wildstar for me.
1. I prefer the more realistic less chaotic art style and world.
2. The customization is awesome compared Wildstar, the paths and stuff are neat but they pretty basic.
3. I dont enjoy 40 man PvE raids for best gear.
4. The World / questing / immersion / lore is far better.
In my humble opinion both of these games are fun and worth your time / money but they are very different games and I think both can possible be very successful. Wildstar is going for the WoW crowd which is massive and I think they will get a lot of them, its fresh its fun the combat is fast paced and smooth, but for me the ESO world has sucked me in hard compared to the cartoon space acid trip world. War plots are very neat idea, bgs are a bonus its one thing Eso is lacking.
I will undoubtedly play WildStar down the line when I eventually bore of ESO but for right now after playing both games ESO left me dying to play more and develop my character further, if you ever played single player rpgs like skyrim / oblivion you will see how much of that magic they did capture. From all the lootable objects, the interactive world where NPCs respond to you based on what you have done and they respond to others based on there experiences its 1 seamless world but its phased really well to still feel like your making a big impact on the world, areas left peaceful after you cleared them and what not, npcs in the next town whispering stuff like "omg thats xxx ive heard of him he did xxx in xxx". Serious rewards for exploration, most of the quests are not given by hubs you merely walk to somewhere and boom quest for that area appears. "pst hey over here by the bush.." kinda triggers. Pick able chests with sick items, aspect runes, and omg dont get me started on there epic crafting system :P
In sumation both games are awsome for many reasons but for me ESO all the way, where do you sit in this debate and why did you chose that side?