I did both, but I did OCR geography. They are both similar in terms of essay writing. Psychology has a research methods section (some maths) also a biopsychology section (like biology e.g the brain/neurotransmitters). A level geography involves physical/human geography on topics like glaciers or global migration (depending on your school) and you need to do an NEA, usually on your chosen topic and this contributes to 20% of your final grade. It’s a lot like GCSE geography. If you enjoy social sciences, you will enjoy it. If you enjoyed bio/essay based subjects you will enjoy psychology. Maybe look at some YouTube videos or past papers or the specification to help you decide.