A 9-5 sounds much more stressful....
My buddy was telling me about his job as a grocer making 10.25, and how they work you like a dog.
Even high paying careers like law and medicine are stressful as fuck.
If you have a healthy diet, exercise, and have proper time managment, you'll be able to handle stress 10 times better than someone who eats ramen and red bull for sustenance, doesn't exercise, and tries to do everything by themselves. Meditation too is huge for reducing stress. When shit goes bad you just take a step back and realize that you're still alive, you're still you, and that you can recover easily.
Once you hit that "flow" state, or state of mental high performance, you can get much more done much faster.