I'll echo tokyodude. Not a valid comparison in the least. The biggest differentiator I can see is that Windows is not, and probably never will be, open sourced. Chromium is.

I would place myself squarely in the camp of those that don't see every browser using Chromium under the hood as a bad thing. It makes every company that has their own browser invested in improving together, for one thing. Also, compatibility across browsers will only get better if that is the case, which is also something that people tell horror stories about from the time when IE was king.