I have hard time believing that you can learn quicker playing chess against AI. Humans can explain ideas behind their moves, their long term plans and their position evaluation. That what chess coaches will explain you and that's what you can read in chess books. Computer has hard time explaining his moves, has no notion of long-term plan and it's position evaluation is often useless for beginner or intermediate chess players (like evaluating position as a draw while one side has to do a series of very precise moves to achieve equality, which is a clearly lost position for a non-grandmaster player).