16gb ram vs 2*8gb single rams together

hi my system is: mb: B450m-a asus cpu: APU Ryzen 3400g gpu: none - i use apu i cant affort to buy dual channel rams i want to know which one is better? A: 1 * 16GB 2666MHz B: 2 * 8GB 2666MHz (not dual channel! but with same information like latency and speed and etc) my usage is gaming