the catholic church made a maaaaaajor mistake a couple of hundred years ago when they required priests to be celibate (personally i think they did it because they were HOMO even way back then), either way, the ONLY way that the catholic church could be "the True church" is if they say everything they've done since the schism was wrong "woopsie, we're part of the orthodoxy again"
i'm personally not sure either is following Christ, but IF there was supposed to be a continuing Church throughout history then that is the Orthodox church, NOT the catholic (as they were the first protestants)