Don't know what macc is but a CPA is valuable certification... it's one of a handful of professions which can serve as a side-job while pursuing an aviation career. extra cash, plus if you stay current you have a backup career in case of furlough, medical issues, etc. Normally I would say do that.
But right now due to all of the retirements you don't want to waste any time getting your career started and getting a seniority number at a major.
I guess it comes down to risk tolerance on your part. That extra year at the airlines would be worth a lot of money down the road, vs. peace of mind.