I'd say take A-Level Comp, since you want to do it at uni. Taking A-Level Comp (like what I'm doing atm) is a massive advantage for uni bc you would already know concepts like OOP or algorithms. Although, there is an NEA to do which could be considered as a pain. Also, tbf most unis don't need comp sci to do it at uni (unless its the top ones like oxbridge or ucl etc.) A-Level Comp (mainly AQA) to me is just memorization and doing exam questions, my teacher isn't that great so i've taught myself most of the course and have been doing okay. But ofc, its your choice