For my own taste, I LIKE choking cloud on my rads.
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HelinCarnate:OMG it is so terrible. I have the option to take 3 more powers but no additional slots. Boo F'ing hoo.
Personally I find that choking cloud is a useful addition to my arsenal as a Rad/Rad, but it's definatley something that people either like or hate and it's something I think you should keep or drop as you think best - or use the dual builds feature and do both!
As for Aim vs PBU, I'd suggest PBU. Not only is it a better damage buff, but it also buffs secondary effects such as Stun and Hold. I like to hit it right before EMP.
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What do you mean Aim *or* PBU? The answer is both, of course :P
I have a Rad/Rad Defender that is currently build out for making use of Choking Cloud and Devastation Chance to Hold procs in a couple of the attacks to occasionally get mobs held, sometimes even Bosses. Though it is not complete right now, I almost exclusively team with him now so this seems to have little return for this kind of slotting.
I had a second potential build that would replace the Devastation procs for Achilles' Heel -Res procs and get rid of Choking Cloud, upping the damage potential, but solo and in teams. Almost everything else is the same. Would this be a better direction to take this toon?
Also, I also plan to get the Power Mastery epic pool, and I was wondering which was a better power to get, Aim from the Rad Blast, or Power Build Up Power Mastery. Aim has less of a damage buff but recharges more often, while Power Build Up does have a better damage buff. Any comments?