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So im thinking of unlocking some Tzeentchy daemon prine goodness and wanted to know which was the better choice for this.

dont have either model yet so would be nice to hear peoples opinions before i purchase

LoC is harder to kill with the increased toughness and greater rewards, plus he is a beast at CC which fateweaver sucks at. Fateweaver has his uses, but I find that the LoC kills sooo much more

The LoC is more of a direct threat, that is true. Giving him the Staff of Change makes him a nice S8 without smashing, and prescience or precognition on himself makes him a beast in combat and shooting. On the other hand, Fateweaver grants you two things that nothing else in the Daemon book really does -- an innate 4++ save, and rerolls for your army.

These two things combine very well with the Grimoire -- it becomes super reliable (~90% chance of success if you use the reroll) and if you use it on him he gets the 2++ rerollable without having to have the 4++ Divination power.

Kairos also knows all the change powers so you can flicker fire for a lot of dice and splash in the ap2 or better beam or blast. You don't need to be good at melee to have a massive impact on the game.

Plus his warlord trait, the rerolls to Warp storm have been pretty big in games its been used against me.

His reroll being once a player turn means he gets a chance to reroll a failed grounding test if he would get one. I find him annoying to kill.

Fateweaver is more of a support HQ while a Lord of Change is more directly killy. Despite Kairos ostensibly being just a special Lord of Change the two really aren't used for the same thing.

They are both good and you can't really go wrong with either one, but they do have different roles.

Kairos is a support piece and mobile gun platform. He mitigates the warpstorm table and bad dice rolls when you need it the most (grimoire, warp storm table, grounding tests etc.). With his variety of powers you are bound to get something that will be useful during the game.

LOC is a beatstick. Give it the staff and feel confident about assaulting just about anything. Excellent piece for linebreaker as it has both speed and survivability (especially with grimoire support).

There is no true answer, it depends on your list. I find that Fateweaver just doesn't pose much of a threat to the enemy. He does little damage, so they will just kill the holder of the Grimoire then target Fateweaver.

The LoC is pretty damn survivable with the greater rewards, plus it will take a lot of firepower to take him down which will let the rest of your army move in easier, while Fateweaver is ignorable for a couple turns.

They are both pretty good but Fateweaver doesn't really kill much.

The 2nd place winner of Wargamescon 2013 used the LoC.

The problem with this poll is it is missing the correct answer, which is both.

Yep im thinking lord of change, more Killy would suit my playstyle better. Im now thinking of running him side by side with a bloodthrister.

I'm partial to fateweaver. His reroll for warpstorm and reroll per player turn makes him fantastic. He can shoot an awesome 3 different targets in one turn which is borderline broken if used correctly. Prescience makes his shooting very potent.
With a rerollable 2++ he can deny objectives like a champ whilst still putting out a lot of firepower.

Still most importantly, if you ever lose a game thanks to an untimely grounding check, a bad grimoire roll or a warp storm fail, you'll curse that you didn't bring fateweaver. He has more effect on the game as a whole than any one LoC could.

If its a one or the other and not both deal I'd say Fateweaver. He just has way too much going for the "he has WHAT!" factor. Hillarity can ensue. He used to be if you dont have him you lose. Now he's more of a if you have him then hillarious things happen that will help you to win but he's no longer the lynchpin of the army.

2 different units that fill a different role in the army, do I want support or more damage?

The answer depends on your list.

As others have said, it really depends on your list. Now, you mentioned you wanted Tzeentch Prince goodness. I'm assuming that you're planning on building a Flying Circus list. For this, if you're not taking allied for another Daemon Prince and Heldrake, I would suggest both. Fateweaver, Lord of Change, and two Daemon Princes will be pretty good.

Load up the Lord of Change with 2 Greater, 1 Lesser Rewards and ML3. The Daemon Princes get Exalted Rewards because they already can get a 3+ armor without rolling on the Greater Rewards.

Depending on who you're facing, Flickering Fire on these FMC can be really handy. Not just for the amount of shots and focusing on the same unit, but getting rear armor on a couple of flyers. With pumping full warp charges into it, it can glance/pen AV10 real easily.

Hopefully this has helped you a little bit. Good luck with your list!