Psychologists are more about diagnosing mental conditions though aren't they? And psychotherapists/counsellors meant to help you to take control of your issues etc....?
Best to go on the BACP website as they are all qualified on there.
A fellow dog walker I chat to is a counsellor though on that site and he tells me stories about his clients. That's not good is it? Also, the psychotherapist I see (client) is highly qualified but I have found him to say some things to me that show up his ignorance a bit (e.g one thing he says is that sex addiction is a fallacy) so...yes...finding a good counsellor is tricky.
I did a basic counselling course and I found that to actually do some counsellor training was a great way to increase one's self awareness which is one aim of going to a counsellor...
Psychiatrists can diagnose and then manage the treatment of MH conditions and can prescribe medication, usually treating people with more severe MH conditions.
Psychologists focus on treating emotional/mental suffering with behavioural intervention, will have done 3 years clinical training as well as having a degree in psychology.
Psychotherapists and Counsellors may or may not have done training courses. This is more about talking therapy. Many will have no medical background or specialist MH training.
Obviously there are good and bad in all categories but I have tried counsellors, psychotherapists and psychologists and found the last group to be the most likely to have a good understanding of MH and what makes a person tick, so they certainly get my vote. The clinical background is a massive bonus.
Depends what you are looking for I guess. And how great your needs are.