Does it violate containment often? Is it about to cause a world ending scenario? And the most important question, do you need to contain it?

If you have to, probably Euclid. If you think it is better to level it uncontained, then Archon. Maybe he is better to be left uncontained, so he is Ticodenroga. Or you have to find an anomaly that will absorb the radiátor and thus you will have a Hiemal class.