which career is better? that question is a bit subjective. It depends on your personal interests and many other factors.
However... if you are talking about getting some cash and finding a job with more ease, if you're into that kind of stuff as being the #1 factor of your career, go with chemistry, but I would very strongly recommend against making your choice based solely on the $$money$$. It's a sad day when people start turning away from things that they love just because of the money. I know that will probably a good size challenge for me once I reach that point, but there are ways around it, and it would be better to do soemthing you love and maybe give up a bit of financial security than to get into something with a lot of money and hate it. (I hope this last bit doesn't start a debate, i am just warning him of how some people just blindly go into a field because they think its not going to be too demanding but will get them lots of $$$ in their wallet at the end of the day)
You've still got a few more years to get into this question, I would suggest you read some more on physics, get some research done on chem, keep your mind open, and ask yourself this question again later down the road.