Wow, what a strange situation. Courtois is a hard case, but if i had to choose i would choose him without second thought. No offence to ter- Stegen of course, he's a pretty damn good goalkeeper with lots of potential but in comparison with Courtois hes proved to be a little unstable at times althought that's normal his age, but comparing generally to the last few season Courtois has been without a doubt better. Courtois is already adapted to Spain knowing the language also, having already a very good season backing 2 great seasons in 2011-2012, 2012 - 2013.
It looks bad to me that Barcelona wouldn't want him but obviously the reason behind it must be ter Stegen, and we couldn't wait. It would be a risk leaving ter Stegen and negotiate with Chelsea and Mourinho of course for Courtois just because now himself wants it. I would say if there was any chance of getting Courtois over ter Stegen do it. But now it seems pretty hard.