100% apply through QB, especially if you’re confident you can be a finalist - if you become a finalist, chances of admission are much better with QB than with just applying ED/EA, as partner schools (Harvard, Penn, UChicago, etc) want to take a certain number of QB applicants and usually evaluate the apps in a different pool than ordinary ED/EA apps. You’d just have to consider the match program and make sure you’re only applying to the schools you’d be ok with attending if you matched with them.