For a few reasons I won't get into, I would never go to a chiropractor, but I think physios can help sometimes.

over here you don't get to choose what specialist you should see, you have to be referred by your gp who will suggest the type of dr you see.
It depends on the cause of your back pain which dr is best. I've seen people at rheumatologists, orthopaedics, neuro drs/surgeons, and some sports medicine drs are really good.

have you been to a pain clinic?