I believe Triple-A is better baseball:
Triple-A: A mixture of the game’s most major league-ready prospects, 4-A players, career minor leaguers, and the non-official “taxi squad” players for a major league organization.
Double-A: The entrance to the “upper minors,” the jump to Double-A tends to be the most difficult for prospects, and tells us the most about them.
https://www.fangraphs.com/tht/unders...league-levels/