I agree with most people here, the science's are more indepth about one area, whereas medicine has the smorgasbord effect of having to learn EVERYTHING.
Both have very high employment rates. And both have similar lengths of times until you get the proper job. Med of course has the 5 year degree plus placements, whilst chemistry has 3-4 year degree, plus a few more for a phD (which you WILL need to get a decent job. Out of ~80 jobs I found on the Uni careers website, only two didn't need a phD. And these 2 were to help you GET a phD)