a sword that sucks your energy when you do not pay attention or do not know how to control yourself.
a suit that turns you invisible, enhances your speed and also makes you more durable.
seems like Enma is nerf more than a power up while the RS is a straight boost in stats with no training, skill or knowledge requirement.
Enma = a sword. one that Zoro was adviced to not take. one that needs to be tamed to be useful
RS = a direct powerup for people who can not even use CoA on Bellamys level