Hard chrome is the best - but, U never said what kinda gun it is.
Hard chroming a revolver is tricky. Some places won't do it, and I've prev read articles in magazines recommending that one not even try, because its very easy to screw up the gun... I don't own a revolver, so I can't comment on that personally.
I have several slides hard chromed - and it is super durable. Pretty much holster wear proof.