Blood Pact: Weak Auras 2 versus TellMeWhen

One of my raid's mages swears to use TellMeWhen (TMW) over Weak Auras (use WA2, now). I used to use Weak Auras exclusively, but now I use a combination of both addons in further combination with Raven, a buffs and debuffs addon, and AffDots. While I can list any number of buffs and debuffs addons to help track procs and DoTs (ForteXorcist, Raven, NeedToKnow, Ovale, etc.), TellMeWhen and Weak Auras often top the list of mentioned addons.
What's the difference between TMW and WA? What does one do better than the other? And what's the impact that addons like these have on how warlocks play?
Filed under: Warlock, (Warlock) Blood Pact, Mists of Pandaria











