I'm no expert in the field, however; I have done some digging.
If you want to go to the academic path for physics, according the
Bureau of Labor Statistics on the job outlook for physicists, a PhD is the standard to work in academia. If you're willing to invest several years of your life a long with debt that you can hopefully pay off, you can definitely consider being a physicists as a potential career path. In addition, there are far 6.5x more jobs as a physicist than as a mathematician. Check out
University of Toronto's input in the field of physics for more information.
For
math, the typical degree is a masters which will shave off a few years. Then again, most of those researchers have a PhD, something to consider too. Anyways, according to the Bureau, the job outlook is much faster than the national average. However, due to the insignificant amount of jobs out there, again 6.5 times many less than a physicist, it's a much bigger risk. Check out
University Toronto's input in the field of math for more information.
If you were to fail to land a research position. In the meantime, you can try some of these potential careers for MATH (I'm ranking them in terms of median salary, level of education, number of jobs, and job outlook)
1)
Operations Research Analyst - $72,100, Bachelors, 73,200 jobs, 27% (much faster than national average)
2)
Actuaries - $93,680, Bachelors, 24,300 jobs, 26% (much faster than national average)
3)
Statisticians - $75,560, Masters, 27,600 jobs, 27% (much faster than national average)
I would go for the Operations Research Analyst since it's more in demand and because you don't need a master's degree. However, if you can land a job as an actuarie, the better. Also, a physics major can also do the job for the operations research analyst.
Not to mention, if you're going to pursue a serious interest in physics, you're also going to do a TONS of math. Generally speaking, it's much easier for a physicist to learn math than for a mathematician to learn physics.
If you're not going to pursue the academic path, still check out those links I gave you for alternate careers and use the Bureau of Labor for more information about those careers.