what i said was sanji can harden and attain same or better hardness which would be better than what RS provides that he uses for offense... what raid suit provides primarily is just better defense and sturdiness..which can further be reinforced by haki.. defensively it makes a difference but offensively arguing that it helps offense is arguing that a steel bat hits harder than an iron bat.. which doesn't make sense coz at the end you won't be able to notice any considerable difference or any all.. so the hardness argument for offense is trivial at most
raid suit hardness > base sanji hardness (his comment on how the raidsuit saves him proves it)
raid suit hardness + DJ + CoA > base sanji hardness + DJ + CoA
it is still steel leg vs rock leg.
he explicitly said that the raidsuit is insanely durable else he'd injure himself from king's attack.