Go for the colour YOU want, not what others think looks good or what the trend is or might be. If it's a toss-up between two colours, you should end up happy either way, but if you really want white, go for white. If you know you'll be happy with CSG, stick with it.
Having said that, there is just something about white that really suits the GTI. As Running Man already implied, it's a classic look for the GTI, and will definitely hold its own against any other colour, now and in the future.