No one meaning your characters/Sirion? Well, it's a damned good thing Jor doesn't care what either think.
In a pure Perdan v. Caligus war, I think it'd be very close. Their capitals are right next to each other. Whoever sacked the capital of the other first would likely hold the upper hand for quite some time. Unless one was attempting to outright destroy the other, or got others involved, Jor would keep Westmoor out of it. He has no desire to see either parent realm perish.