Anecdotal evidence aside, that really depends entirely on the nature of the injury and the skill of the practicioners involved.
Hmm....not too sure here.
Like Jake, I have had a bad experience with a Chiro, who wanted me to go repeatedly. In my experience it was nothing more than a waste of money at a time when I didn't have any to waste. It did nothing to resolve anything.
I have friends who seem to 'need' to see their Chiro and/or Osteo every month as well, one who has been going to one for years on end. This person will swear that they are the best thing since sliced bread. Surely they should be working towards fixing the problem, not just a bandaid that has someone in pain again if they don't re-attend within a month.
Unlike Lil, I haven't had great results with Physio either. I've had nasty sprains in which they took the same length of time to heal as they would without Physio. I've been to them to help with my hip issues (osteoarthritis) which again, didn't help in the least. Oh, sorry, I tell a lie.......one sports physio kept me on skates for around a year by getting me to 'self massage' by kind of sitting/laying on a golf ball to release the muscles in the sciatica and getting hubby to cause me untold pain before & after skating by putting pressure on a particular groin muscle that used to tighten, & pulling at my leg. Sounds weird, but it worked.
Other than that, the only other non-doctor, professional I have had results with is a Massage Therapist as I get nasty muscle cramps in my left leg, again a result of the osteoarthritis. It used to be so severe that I would be in pain just walking & the only thing that fixed it was a good, very painful, massage. I'm now on some anti-inflamitories that have somehow improved that, but I still get the muscle cramps, just not as bad.