As a current University student I would suggest you go to University, above all it gives you life experience and also shows that you have the desire to suceed. I believe that altho CTC don't require you to have a degree, the Uni experience as a whole will give you a much better chance of getting through (atleast i hope so anyway).
I'm currently awaiting stage 2 for CTC and i think by the time it comes to stage 3 I will be able to demonstrate the skills I have learnt at Uni, and relate my experience to many of the questions they will no doubt ask.