Chrome is a plating, polished is a finish. Polished will dull out but can be brought back to life relatively easily. Chrome can chip and will need to be entirely replated to be fixed.
i think chrome has a better appearance...and if you are good at keeping them clean and dont slack off then chrome a 110% i dont think i could run a different rim on my car...but when its summer time i clean my wheels every day so i dont let them get dirty im sure if you neglect them they will look like crap and ruin the finish