I think you should choose your toilet colour based on the decor of your bathroom. If it mostly consists of blue decor then go ahead and choose a blue toilet, But if you have a bathroom mostly consisting of light and airy decor then you should choose a white toilet. At the end of the day, It is a toilet and it shouldn, T really matter unless you want your bathroom to look nice and put together.
There are different kinds and colors of toilets but I don't think people care what color it is. The job of a toilet is to take away your waste. It is not really a luxury thing. So, In short, It doesn't matter to me what color my toilet is. (I have to put a few more words:P)