it depends. I did both for my gcses
Edexcel History comes down to a lot of memorisation, application and learning a lot of knowledge. Requires tremendous practice and is kinda tormenting
OCR COmputer Science is renowned for its hellish programming paper. Compsci requires less of the knowledge, but you need be real good at programming to ace paper 2
if you like a particular subject more, choose that. but for me, I wd choose our compsci