Xtal for circle of order?

Making a tank and I am confused on what crystal should I put on circle of order
- Dusk machina?
- Candella II?
- Grylle?
- other, state the crystal

Mind explaining why I should use that specific crystal? It would really help me a lot from extracting it all the time

 

Dusk Machina - The best for tanks. HP and Aggro all in one and the negative stat doesn't matter for tanks. Expensive though.

Candela II - Also good as the ASPD can help with proration and AMPR. The -MP might be a bit of a problem on some builds(provoke and p.def spammers) though. Cheap

Grylle - meh.

Corroded Knight Captain - Stay away. Stats are semi useless on tanks. Got confused on this and Lyark Master Specialist, price isn't expensive and is rather cheap.

 

i think similar can use gyrlle if u have low mp and cheap price candela 2 uhmm not for my build

 

I say Dusk is best for Circle. Grylle can be 2nd alternative for more guard rate. My equipment gears currently lacks ASPD boost but with enough MaxMP (Magician Ring +1000 MP) and AMPR combo (Guardian + MP Recovery from Shell Break L10), Candela is not that much needed. You can use Candela for your mercenary gear tho, since mercs don't need MaxMP (aka it's useless).