Generally your GCSE choices aren't going to make a huge impact in the long term, so the most important thing is to pick subjects you're going to enjoy, as well as making sure they meet the requirements for the A levels you might take.
Personally I'd pick computing over ICT in a heartbeat, as it stands I've done a GCSE in neither. I'm doing my computing A level now and I did a DiDA course in ICT at my secondary school, and in my experience, computing is by far the more interesting, useful and respected discipline.