Turmoil pure, 100%, but with being maxed out (99 attack as well) you may want to think about 40/45/70 defence, as you'll get shit on by turmoil mains at 110 combat (maxed out w/ 99 atk), sorry, i know from experience i get raped by turm mains at 100 combat.
Get 30 def through the turmoil quests and get proselyte. Good def+ you have a reason to have 99 prayer apart from to look awesome. I think the account would be much better as a maxed turm pure. It'll make training slayer alot easier too.