Both are released during countershock, as that's when the fight-flight response is initiated.
I'd probably say that adrenaline and cortisol levels are higher during countershock than resistance, since physiological arousal is greater during countershock than resistance (even though resistance to the stressor is lower)
If you heard you were fired from your job, then you might immediately feel your heart and breathing rate increase (alarm reaction). Even though the stressor of not having a job might remain for a while (resistance), your level of physiological arousal probably isn't going to be as high (you're probably not going to be walking around 24/7 with dilated pupils and a pounding heart), so the levels of adrenaline and cortisol in your blood, even though they are still elevated, probably won't be as high