Can I choose both computing and ICTWatch
Computing focuses on how computers actually work, programming, hardware, software and so on. ICT on the other hand focuses on how computers are used, and their applications, including networks, databases and spreadsheets etc, with a broader look at hardware and software and their uses, for example word processing.
I currently do computer science GCSE, and it is very much focused on hardware and coding programs and computers rather than the uses of them. There are a couple of modules in our OCR specification about computer security and the ethics of programs, but otherwise it is very much about e.g. creating applications rather than using them.
It might be slightly different if you are referring to A-Levels and not GCSE options though. Hopefully this helps!