If 3 statting I would do Det > Parry > Acc personally. But it\\'s up to you. I personally think parry is more of a return than crit if you are raiding in the long run. Survivability is the essence of tanking and you and your other tank are effectively the only party members assigned the role of provoking and mitigating incoming damage. So while every party member can dps, not all can tank.

The greater the damage mitigation on the tanks, the less demand for healing on them which means allowing the healer to heal someone else who might be dying or even dps for a hot minute. I feel like the potential team dps is greater with a mitigation stat tank in a raid situation and allows for more flexibility in strategy and practice.
IMO the returns in crit are minuscule in the grand scheme of things in regards to tanking in a raid. But do what ever you like. If you don\\'t like it you can go back and change it until it suits your needs. That\\'s what makes the relics quality investments.