Anesthesiologist with pain training.
Take a long look at the markets in locations where you/spouse would like to live. Talk to a few pain practices and see if they may be looking to hire and what realistic salary expectations may be compared against anesthesia hours and time.
I live in the Northeast and the pain market is wildly different than the South and Midwest. If the area you can see yourself practicing in has what you consider to be appropriate opportunities for pain, go for it. If it’s a tight market, you’ll be better served by practicing anesthesia.
If you’re uncertain where you want to end up, you can always do the fellowship year and see where it goes. Anecdotally, I do think there are way better jobs in the South/Midwest than in the Northeast/Northwest, but your mileage my vary based on your intended area.