I took both of these subjects and in my opinion history is a lot more intense and a lot harder to gain marks on without precise knowledge. If you have the motivation and you genuinely find it interesting, history is a really great subject and you also develop loads of really good skills. I've always found geography a very easy subject but there are such a range of topics that it can be difficult to retain interest; to explain this, my school chose to do a topic on coasts which was the dullest part of the course.
I must also add that the gap between history GCSE and the first few years you learn in secondary school is incredibly different, at least it was for me.
If you really enjoy both subjects, I would take them. At the end of the day, enjoying the subject is going to make it a lot easier to endure.