There is no one best college or university for any field. First of all, psychiatry if a field of medicine so it requires an M.D. degree. Psychology on the other hand, is a field that is related and addresses some of the same problems. It is a common major at many colleges. My daughter for example is majoring in psychology at Guilford College in Greensboro, NC. It is the largest major in the college and Sarah reports that she loves it. The quality of the faculty of a college or university can be inferred by perusing the college website under "academics" and then looking for the psychology major. Good luck!
If you are in Canada or USA, you may wish to speak to National Education OnLine Centers.
They provide free services to students seeking post-secondary educational institutions. If you are located elsewhere, contact them anyway as they may be able to direct you further. 877-516-1020