Its going to be both, but either way he has to accept who he is not run from it.
Sanji character is based on Zeff, who defined all Sanji values based on his martial arts, cooking and chivalry, the exoskeleton will maximize those Sanji qualities, while RS destroys those qualities.
First, Sanji is a fighter who doesn't depend on any equipment, much less a power-ranger outfit. He's been a martial artist like Zeff since the early days of manga.
Second, speed boosters pushing in only one direction disqualify many of Sanji's techniques. This goes against Sanji's martial art style that moves in multiple directions.
Sky Walk / Geppo directly contradicts the use of boosters. For Sanji to advance naturally he has to step on the ground (soru) or in the air (geppo). How can he do that when the booster is on ?? The booster continuously drives your leg forward. And the technique requires up to ten sequential steps in an instant. Which means boosters replace technique, not improve it.
Third, his protective cape doesn't qualify on the Sanji character either, he's an agile martial artist and doesn't need a shield.
RS doesn't ruin Sanji's character, but it ruins his character's style and how he was written throughout the story.