They’ve both got their strength and weaknesses in essence. Although, a lot of people at my college are saying psychology is the hardest. But it’s down to the individual at the end of the day!
I take both and for me personally I would say sociology. There are some concepts which take some time to understand and essay writing is tricky for me (20/30 markers). However, sociology is more interesting to me than psychology but I still do love both subjects.