Yes I got a white one. The theory is, I'm told, that the white reflects sun and helps keep the lens cool on warm days. That might prevent distortion caused by things expanding inside the lens. Or so the theory goes. It makes sense to me and the white one wasn't any more expensive. That was the reason. I've never owned or even used a Canon camera in my life but I think they are excellent. But I have no interesting in changing brands after 40 years as a Nikon shooter.
What is really interesting to me is the VR. Like you, I used to use the 80-200 f2.8 but I want to give the VR a try and I'm told this lens is every bit as good as the 80-200. If I don't end up liking VR at least there is a switch to turn it off. So that's how I went the way I did.
Sorry but it had nothing to do with Canon.