Originally Posted by
Javeliin
I'd just suggest trying demo out, though demo is kind of horrible in 5mans after you get used to destro and trying to get a good hold of it atm is hard since raids aren't open yet.
In general I'd suggest, since we're talking about a pure DPS class, adjusting your attitude more towards "I'm a warlock" rather than "I'm a destruction warlock". It's ok to want to play the spec that suits you the best, but you mentioned mythic raiding where everything counts. You should always play the optimal spec (which demo looks to be, but the buffs/nerfs are still pretty fresh).
I thought about waiting for a bit, but destro feels so horrible now that I just said fuck it and went demo. I'd say in a few days we'll have an answer how much better and how much worse demo and destro have become (more than in just numbers on paper) so you could wait a few days and then decide which colour you wanna all in on.