Ok, taking into account the "outwardly offense-based" powers, i still give it up to the wolves over the sons.
Warptime and wind of chaos combined can be pretty heinous, ill give you that. But thats ALL we thousand sons take. Gift of chaos SUCKS because you have to use it at the beginning of your turn (NOT in the shooting phase like the demons counterpart, boon of mutation). Nurgles rot is a joke, lash of submission is a thing everyone prepares for now....and DOOMBOLT?! please! Your talking to a guy who has an ARMY of S4 AP3 bolters!!! why the HELL would i need doombolt?! (same goes for the tzeentch demon weapon...hey look! its MORE S4 AP3!!)
Lame.
Now, The Jaws power, as mentioned before spells death for a lot of things. But there are whole threads dedicated to its ridiculous power, so i wont get into it there. Suffice it to say, that for comparison reasons, the Jaws and Warptime/Wind of Chaos cancel each other out.
The wolves have a 3d6 shot, unlimited range, St7 weapon. Awesome for killing rhinos, chimeras, trucks, sentinals, rear armor on just about anything, shaking and stunning armor 12 (eldar, im looking at you)....The sons? we have a one shot wonder! The bolt of change. We have to pass our psychic checks (because we have to do that now, unlike before when we could just auto-pass), then we get ONE shot at BS4. You know the frustration and angst of having a lascannon miss? You know, because they ALWAYS miss? its like that...only once you miss, the thousand sons have very little else to pick up the slack. We dont have meltaguns, or plasma, or flamers. We're so expensive, theres little room for oblits, and chosen, etc.
The wolves have a character that causes a STORM (literally) of negative effects on the enemy that actually....*GASP!* ...has a noticable outcome on the game! The first teir in this storm is dropping your enemies Ballistic Skill by 1. That right there would spell doom for a thousand sons army. or any other shooty army for that matter (other marines, chaos marines, IG, eldar...). It causes break checks on unengaged units, it makes a huge area of effect difficult terrain, it starts sending down bolts of lightning to hit vehicles on side armor...It just seems like the author of this book has his head up his *** and just wanted to make an awesome good guy psyker, "cuz i luvs my space marines, cuz they're just so cool and awesome...and cool!".
Meanwhile, ahriman is +5 points than the Storm Caller and about as useful as a paper plate in a hurricane.
Lame