Jeff,
I probably have a different view to most.
But think of it this way, What's easier to clean when it comes to walls inside the house?
A Flat Satin/matt finish??
or
A smooth Hi Gloss Finish??
I think everyone will agree that the smooth Hi Gloss finish is the easier to clean. Even if you get a matt finish clean it still leaves a halo effect where the stain was.
With that my preference is a Gloss Finish.
I have white wheels with a 2K Teflon Impregnated clear over the white, nice & glossy, yea the brake dust & Chain fling build up quick, but with the teflon coating, it litterally just wipes off & they look like new again.
You can pull into a gas station grab a piece or paper hand towel & literally just wipe the grease & brake dust off.
Something to consider!