The Raid suit is absolutely a power up. Anything that allows the user/wielder to be more efficient or enhances their natural skills in battle would absolutely fit the definition of the term. Sanji is not automatically made stronger because of the RS, but it does make him a much tougher opponent in a fight, so it has to be considered a huge boost. This is off topic, but since it’s already been mentioned multiple times, Enma is also a power up for Zoro. I will not be taking questions.