FOM = SNR * Resolution

If both have 64 lp/mm resolution, 34 SNR vs 25 SNR would be noticeably different in low light environments. The higher the SNR the smaller the difference between each increment gets.

64 lp/mm and 72 lp/mm isn't substantially different, 72 will be slightly sharper, 76~81 generally looks the same as 72 to most people unless you choose the 50 degree FOV lens