What appealed to you about your first chosen pathway, and why? Are there parts of the "good" stuff that you could look for in your other path, or find for yourself in your spare time?
What parts of the new option do not appeal, and why? Are these little parts of your day or big parts? Do you think you'll get used to it? (Hint: your answer to this last part is probably too optimistic if the answer is "because it's boring/annoying")
Does the new path foreclose the first, or could you switch back at some point?
I'm a lawyer, and I started down the BigLaw path because I wasn't sure about my chosen field, and I knew that place would give me options -- e.g., rotate to another department if the first one didn't work out, give me a good resume if I decided I wanted another environment altogether. I just don't have enough experience in the medical field to know if that principle would apply to your options.