Well it seems an obvious choice, If you prefer biology and your course prefers 2 sciences take that regardless of whether its relevant, it sounds like your university will just class Computing as a normal 3rd subject so unless you know you will be able to do much better in it than biology its better to be safe and meet more of the universitys criteia, especially if you prefer it anyway.
I noticed GCSE to AS wasnt a huge step but apparently going from AS to A2 (Im going into A2 next year too) it is a big leap (what Ive heard from current A2 students) apparently the work isnt too much harder, but there is alot more to know so you just end up putting ALOT more hours in, or at least thats what I was told.
Yeah it was the same problem for me when i was bout to start AS... Biology and Computing seemed both equally interesting. But in ur case as Steeevo said bio sounds a better choice.
Im going to start A2 as well. And honestly i didnt notice a huge step from GCSEs to AS... infact im keeping 4 subjects in A2.
well i always found that doing the subject you wanted to do most paid off more (in the sense of achievment) hence the biology.
however i cant say computing wouldnt help, but i dont think it will stop you from doing your desired course - provided u get the grades required or better
I thiink you should do biology. Whilst it's true that computing would be more relevant, you don't actually need it for your course and even without biology, you'll have 2 sciences because maths is classed as a science, so stick with what you enjoy more and are more likely to get a good grade in.
Yes - Biology would be a better choice. And remember that Biology is actually a valuable science in Engineering, since it could be used in Biomedical Engineering... Anyhow, just make sure you are entirely happy with your choice.
Hope that helps...