The clear coat does tend to turn yellow in the sun. I'd try and polish them first. Try Meguiars Scratch X, it works pretty well. You can do this by hand or with a small random orbital. Just don't over do it, as you can burn through the clear coat with too much pressure.
If this doesn't work, you will likely want to strip them and then polish them. You can do this yourself too.
Chrome looks good and cleans up easily, but ..... if you ding one, you'll have to send it out and get it re-chromed, which can be expensive and time consuming.
Most of my wheels are "non clear coated" polished aluminum as they polish up very nicely and you can remove minor curb rash yourself.
Good luck,
Dan
![usa :usa: :usa:](/vca/styles/default/xenforo/smilies/usa-clear-s.gif)