Further maths or computer science?

I started college last week, and the A level subjects I’ve chosen are physics, maths and computer science. However, I didn’t do computer science at gcse, so I’m going into this blind. I’m worried about coursework, exams etc. because I have a feeling it may be too hard for me. So I’m considering switching to further maths (which I know is also hard). Is it worth making the switch? I got a 9 in gcse maths. How hard is further maths compared to computer science?

Computer science (definitely for OCR and I think for other boards too) doesn't have as much of a GCSE to A-level progression as other subjects because it's relatively new as a subject, so you shouldn't need to worry much about not knowing GCSE content.
Comparing the GCSE and A-level, I've been retaught all of the pertinent GCSE content in the A-level, so I assume it would be similar for your college.
Coding might be a problem if you don't have any idea at all, but the expectation is not very high so it wouldn't take much effort to be at a reasonable level from scratch and if you know some already you'd probably be alright.
The coursework is a fair amount of work, but if you're proactive you can get the best part of it done before the big academic crunch when your exams are approaching.

Further maths is definitely harder in terms of raw content, but if you really like maths and/or don't think you'd be able to keep on top of the computing coursework it could be an easier option overrall.
Computer science also has lots more marks in remembering definitions whereas further maths is applying the techniques you've learnt. Again, the maths content is harder, but it might also be something that suits you better.

For maths/FM I'm with Edexcel and computing OCR (also physics). Computing is the subject I find the least effort, but I also think it's a bit slow and boring at times (teaching may vary). I'd put FM as second hardest behind physics, but I'm very pro-maths and not such a fan of the writing-heavy questions in physics - they are probably inverted in terms of actual complexity of content.

If that got a bit long;
Computing is much easier, there probably won't be many gaps from GCSE knowledge, you'd probably benefit from a bit of coding (but maybe not much), and the coursework is something to bear in mind.
Further maths is a good deal harder, there is less rote memorisation than computing, but there is still a lot of content. Strong interest is probably more useful than for computing.
If your college accomodates for it, you could try taking both simultaneously for the beginning of the year and then dropping one.

Pretty much agree with all Rufus's comments. About the only thing to add is the oxbridge++ universities would probably value FM more for computer science/engineering/maths degrees.

I read about that online!! It’s one of the reasons I considered further maths instead of computer science. But I think it’ll still be okay with computer science? I’m thinking of going into aerospace engineering further down the line so I reckon it would help to have some knowledge in computer science. I would do both computer science and further math but I’m afraid all my subjects would be impacted and it would be too much for me. I think I’m going to stick with computer science, and it can help me widen options for degree.

I read about that online!! It’s one of the reasons I considered further maths instead of computer science. But I think it’ll still be okay with computer science? I’m thinking of going into aerospace engineering further down the line so I reckon it would help to have some knowledge in computer science. I would do both computer science and further math but I’m afraid all my subjects would be impacted and it would be too much for me. I think I’m going to stick with computer science, and it can help me widen options for degree.