TTI Header Coating question

I have TTI 2" in polished ceramic coated. I am upgrading to 2.125 stepped headers as i've crested the 600hp mark, and dyno'd with 2.125 headers. My question is.....

Is there a big difference between the ceramic coated and polished? TTI has a set of 2.125" in stock and coated, but not polished. polished will take 4-6 weeks, maybe more.

Should I just get the ones they have in stock?