Originally Posted by
Kirroth
After thinking it over and looking at the options, it might be that the correct answer can change with circumstances. And by "circumstances" I mean "which legendary drops you get first".
Power Cord of Lethtendris has a 25% chance to refund a SS if you cast UA on a target that doesn't already have UA on it. Streten's Sleepless Shackles increases your damage by 4% for each target with your UA on it. Now obviously, those both have the most effect with a multi-target situation where you're spreading UA around instead of piling them all into the same target. But in a single target situation they'd seem get the most impact from going for high uptime while deliberately renewing right after the previous UA falls off. So if those are your first legendary drops, maybe you'll want to spec Contagion and play that way.
There's similar talent considerations for the other Afflic legendary items. If I parse it right, Hood of Eternal Disdain is an Agony specific +20% Haste, which would reward taking Writhe in Agony. Sacrolash's Dark Strike makes Corruption a 60% snare, so Absolute Corruption would be amazing for any fight with kiting elements. It's interesting how they push you to pick complimentary talents. Maybe that means by the end of Legion when we have a full set and can equip them all at once we'll be pushed into a cookie cutter spec. Or maybe that'll never be an issue because you'll never have a full set, or cap will never be high enough to equip them all at once, or more legendary items will be introduced in patches so there's always more option than your equipped cap allows. We'll have to wait and see.