Okay, I have read that series and also found it quite enjoyable, but I think there are some serious differences between spren and furies. Spren, it seems, come from everything. Most seem to be either created by or come around because of events- LifeSpren around plants, etc., DeathSpren when something is dying, FireSpren around fires, HonorSpren are drawn to the honor of a person, you get it. Furies were independent creatures that had no need of any triggering event to exist. And you could use a furie's powers to change someone's emotions but I don't recall wild furies being able to do so.
Also, I don't remember where in WoK it says that spren directly change someone's emotions. I remember people reacting to them and becoming happier or sadder but that doesn't mean the spren intended that to happen. Just because I see a deer eating and it makes me happy for example doesn't mean the deer chose to do so. It doesn't have that power ( O.o;; or does it? ).
And as far as we've seen thus far, DeathSpren come around when something is dying, they don't bond to people to give people that mastery. The only type of Spren we know to confer powers are HonorSpren- but are there different types of HonorSpren that confer different powers, or are the ones that give powers other than Kaladin has other types of Spren? We know there were 10 orders of the Knights Radiant and I imagine they are each linked to one of the Ten Essences, particularly after the very end of the book when Talenel'Elin introduces himself as "Stonesinew, Herald of the Almighty" and it matches another of the 10 Essences we see in the back of the book. Kaladin's is obviously Zephyr.
2. If people have read the Codex Alera Series by Jim Butcher, you would know what Furies are. In Codex alera furies are everywhere and all alerans have access to the powers granted by certain Furies. Air Furies give increased speed, and the ability to fly. Earth Furies give increased strength and the ability to influence emotions. Water Furies give the ability of healing and shapeshifting. Metal Furies give the ability of increased endurance and mastery of metal weapons. Fire Furies give the ability to induce anger, control fire, and manipulate energy. Wood Furies gives the ability to bend flora to you will and camoflauge. Now in WoK you have Spren. To me it seems like Spren act like the furies in Codex alera. Granted they're are a lot more spren, and they do not only effect the elements but emotions as well. I assume though that Spren gives ability to people as well. My question is though, does different spren give different powers to people like Deathspren giving a person the mastery over death, or a Windspren giving the ability of flight, or can only certain type of spren interact with only a certain amount of people?