I had this same question to answer this summer. I decided to not get the tunnel portion of my wrap; as my personal preference is a polished tunnel.......for now. Once you get a few hours (beerz) into a tunnel it sheds snow just as well as any wrap. My tunnel never has snow stuck to it; and only requires a quick (one beer) going over with polish to keep it up. I do think that the wrapped tunnels look awesome too though.......
After a year of riding my tunnel still looks the same as it did when I finished polishing it before it was ever ridden. Then again I've never been mistaken for someone that rides hard either.