Which of the nickel-rich NCM and NCA is structurally superior as a cathode material for lithium-ion batteries?

As two typical layered nickel-rich ternary cathode materials, NCA and NCM are expected to be commercialized in lithium-ion batteries. However, NCA is more stable than NCM, because the structural stability of Al doped in the nickel-rich layered oxide is stronger than Mn.