RS is quite a bit easier in comparison to Geography but still considered a "good" subject. It's also really interesting. Also, if get to choose the religion, choose Christianity and Islam, as there seems to be more resources available for those religions. I personally found Geography boring but I know many people who really like it (although, at GCSE, most of my friends preferred RS over Geography as it was easier and lessons were more fun in general as you we got to talk about and debate many issues and current news etc)
I always recommend RS to anyone (aLso lets you examine other people's views which I think is important) but take geography only if you really really like I, or else it will be a chore (anecdotal evidence from my friends)