Back when I was a medical student (1990s), a very wise surgical resident gave me this advice on choosing a specialty. The advice was quite perceptive and I thought to share it with you all.
Do NOT choose a specialty based on how miserable or long a residency is. Residency is NOT reflective of what life is like after you finish. Keep the end goal in mind, but not the process. 5 years (+/- a few years) is a small price to pay for a lifelong career decision.
With that in mind, think about what you want your call to be like once you are done with residency. Do not answer these questions as a medical student or even as a resident, but answer these questions by imagining yourself being 45 years old with a family and kids.
1) Do you like (or don't mind) emergencies?
2) Do you like (or don't mind) call?
3) Do you like a regular, planned schedule?
These questions determine what the rest of your life will be like and its quality regardless of the specialty.
If you answer yes to 3, and no to 1 & 2, pathology, dermatology, radiology are for you.
If you answer yes to 1, no to 2, yes to 3, than ER.
If you are ambivalent to 1 & 2, and yes to 3, than ENT, ophtho is for you.
etc etc etc.