I'm in year 11 and took geography, currently working at a high grade 8. I can't speak on behalf of history, since i didnt take it, although alot of my friends have.
Personally, I find Geography easy, the content is quite simple to understand, but theres quite a bit to remember, but this can be solved with an effective revision strategy. I haven't done paper 3 (since my GCSE's are still a mystery) but from what I have done, it's research based and should be the easiest paper considering you are given a pre-release beforehand. The content can get boring, but my teacher is amazing and I mostly used group study for geography (painfully 3 hours long but fun and effective). I would recommend it, but I guess I am biased.
From what my friends have said of history, there is quite a lot of content and it is essay based so you must be good at english to get a good mark. They've all enjoyed it quite a bit, so if you like it then go for it!
Good luck!