EE&CS at UCT = Computer Engineering at UP
More like EE and some CS. I was there too. You guys do about 1/4 of the modules we completed and none past 2nd year level.
What I would rather say is that after doing CE you are an EE with software engineering skills, rather than EE with Computer Science.
I have to explain that statement tho, Computer Science isn't about programming. Programming however is covered well enough in CE that you could go into 90% of the IT jobs in SA.
So to the OP my advice is, which do you like more, electronics (EE/CE) or mathematics and theory related to computers (CS)?
You will definitely do programming in CS, probably a bit more than CE, but you will also cover a much wider range of CS topics with plenty of theory. Included in that are mathematics, some covered in CE but many aren't (numerical analysis, discrete structures, etc), mathematical statistics (the same done by actuarial/financial mathematics students) and also some physics (the same modules done by BSc(Phys) students). That is first year. Then comes second, which is more focused on CS but once again, mathematics (not covered by CE), CS (mostly covered by CE) and some basic "engineering" modules (covered in detail by CE and then some). 3rd year is only CS, none covered by CE.
Also as you go further, at least at UP, CS becomes completely theoretical. I spent about 3% of my time in Honours on programming, the rest was doing research and writing research reports (Articles). "Practicals" or projects in honours will be handing in of a research report (around 10-20 pages and should be in the form of an article). As an example, if you do Artificial Intelligence in Honours (there are 3 modules related to AI), then you will get 0 marks for programming (yes absolutely 0), the only thing that is ever marked is your reports (3 during the semester and your final exam which is take home). Your year project is also a research project.
That is CS in a nutshell. If however you like the practical side of things more I suggest CE/EE because most of those I talked to that continued their work there said the experience was entirely different.