As a person that has leveled both would say ninja is the easier to master but more prone to mistakes mob turn at last second, or lag spike and you bunny a mudra. This is alot more damaging then mnk missing pos or even GL dropping. However monk it much harder with fights where GL will run out and learning to keep GL up at all times is harder then huton for ninja. While i would give the crown to mnk being harder to master by a nose to say ninja is in same boat as sam or rdm is just not true. I also leveled rdm and starting on sam and they are far easier to play then ninja.