I enjoyed all 3 for different reasons. I guess the underlying theme is less paperwork and not having to deal with non-medical social issues.
I actually liked pathology the best because it's was the most intellectually satisfying speciality for me and there are so many subspeciality areas of pathology ( there's like 20 different fellowships for path). I also liked the routine of pathology. Sit in your comfortable office, drink some coffee, look at some slides, dictate a report, and repeat 20 to 50 times then go home. I didn't pursue it because I was worried about the job market. Pathology is in the middle of the road for competitiveness, at least from a board score point of view. The average step 1 score for path is a 226, which is the same for internal medicine and anesthesia. Top tier programs are competitive, like any top programs.
I liked radiology for similar reasons. I liked the routine, but I thought the material was kind of boring. It was too vague for me. Instead of diagnosing an epithelioid gastrointestial tumor in the stomach, you'd, as a radiologist, just say "a mass measuring 4 x 3 x 3 cm is identified in the anterior wall of the stomach." You might add "suggestive of a GIST," but you'd never know if you're right, unless you looked up the path report later. I also didn't like the pace. Its non-stop work, at least from my limited experience.
I like anesthesia for completely different reasons. Its actually the least intellectually satisfying, but I think it's fun and exciting. Lots of procedures. Helping people when they are the verge of death. Good hours. I also like critical care medicine.
You will find that you like the day to day work for some specialites and completely hate other specialities. I, for instance, could never do any surgical speciality. I just dislike surgery that much.