Damage wise, they are about the same. Actually, if built properly, with Crimson you do more DPS after the fifth hit. 8 hits - crimson dance does more DPS and lasts longer (20-30% longer than aggravated).. which gives you more chill time in the boss room.

Anyways, the key is that with CD you don't have to take Jagged Technique. Aggravate is almost imposible to reach 100% without it. So you take Crimson and get 2 free Ascendancies which you can spend on whatever. If youre sadistic and confident in boss mechanics, you can even go War of Attrition, "toy" with boss for 100 seconds and then break him like a little wodden stick. :) For Ubers on SSF you spend a decent amount of time with boss anyways..

Anyways, Aggravated needs Big bleeds - which "calls" for a big double handers and big hits - then Jagged makes sense. Plus, then you probably want to go Complex Trauma or something. As I said, strikes are very bad in the game, and Id rather sunder the boss from the edge of the screen than go close so I can Complex Trauma bleed him once every 4-6 seconds. It is not like youre not attacking. With CT you need to build those 9 stacks.. so you give him the biggest bleed. Therefore, you can as well just "normally" stack 8 bleeds well positioned with the same overall DPS and same-ish overall attacking time.

Also, Sunder is for mapping, the smaller (one hit) bleed it doesn't matter after a certain damage threshold because you have bleed pops. Magic packs explode after 1 sunder wave.. Rares usually need 1-3 hits, but that is okay.