I did some research on this possibility last year. Yes, they will pay more, but you will also have significantly less time off. Plan on 8-10 days off a month. As an FO you will basically be on endless reserve/reassignment status. Even the bad US regionals have better work rules. Also, EVA has its own wholly owned regional airline, UNI Air, so there is a chance you can be assigned to the ATR, so keep that in mind.