From the standpoint of fostering the growth of human telepathy, AEGIS makes much more sense than the Psi Corps. It is, after all, a much more popular group that's much less likely to find enemies and resistance everywhere it goes.

From the moral, or human rights perspective, AEGIS is clearly and unarguably the superior option.

From the standpoint of restraining telepathy related crimes, the two come out about equal; the Corps' greater control and coverage starts as many problems as it blocks.

Only from the standpoint of the EA's fascist-flavored government, or a genetic minority's fear of persecution, does the gulag-slash-mamelukes approach of the Psi Corps begin to make sense... And unless there've been cases of Tau Ceti's native telepaths being beaten to death by howling mobs, I'm hard pressed to see where the 'protect our own' angle internal to the Corps would have them driving the invasion.