Yes, in the same way that some doctors are 'better' than others. Feeling comfortable with them is often far more important than the letters after their name or number of certificates on the wall. The certificates held by any professional indicate that a certain course has been completed. We then need to ask how relevant that is to our needs . . . Formal training of the facts may not be enough.
True healing is an art as well as a science.
Somebody who has already put a lot of time and effort into healing themselves. Good healers will have been through the healing process. They'll be able to guide you through the changes you're likely to experience. There may be no such thing as a 'good healer' as such . If you're looking for a more general healing - to help you feel more relaxed and contented in life, then look for someone who lives that state of peace and contentment.