All it took was a little bit of checking on the Lodestone, to see that the relic Zenith and the relic Atma had the same stats. At 2/12 atmas here, I'm nowhere near the point of verifying what others have already said, but from what they say, the atmas are the grind, the books are easier and can be done in a day each (that includes both the grinding 1500 myth to buy it, and actually doing it).