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While polished stainless steel has the shine of chrome, there are some other differences. Stainless steel resists attack by rust "all the time" while chrome plated steel resists attack by rust only until any flaw or crack appears or is created. It is then vulnerable to attack. A scratch on stainless steel, while unsightly, is not going to open a path for attack by rust.
Which is better? Well, it's not always clear. It depends on how well the chrome plating was done, what grade of stainless is used, and how the stainless was finished, as well as the exposure conditions. Purists, however, will prefer the polished stainless steel. It looks similar to chrome in it's mirror finish, but resonates more color, allowing you to see the true metal without it being covered by plating.