By eventually do you mean days, months, years or eons? Chrome is probably 'harder' than nickel but in an AB I don't think I'd worry about it. Nickel is plenty abrasion http://www.modernhc.com/nickeldivision.html resistant. That is unless you clean your AB with sandpaper.
Following what Snibs posted, my Evolutiion has Teflon seals everywhere, including the seal for the paint cup - all from the link he posted. For our use, IMHO, Nickel plating is fine but chrome is 'prettier'. Unless you're allergic to nickel.