I think SAM is pretty easy, but it also depends on what easy means to you. SAM can be somewhat abnormal in that it's more priority than rigid rotation and you have to properly balance kenki to be optimal, but for me it's much easier than DRG because your resources are static. You never lose sen or kenki so you don't need to worry as much about risking a last attack before you dodge or prepare for a coming phase change or something like that. You can just DPS your heart out in your own little SAM bubble.