I'm not aware of the science behind this, but I believe I once read that delusions are often more common in bipolar psychosis than even hallucinations. That has been the case for me, though I have had both visual and auditory hallucinations in bipolar manic and even depressive psychosis. I'm not sure which type of hallucinations were more numerous for me. I think about the same.

I believe that many people with schizophrenia more often have auditory hallucinations than visual. I think I heard that in a video I watched for my Abnormal Psychology class. I remember watching a video interview regarding John Nash. They said that most of his hallucinations were auditory, despite the movie Beautiful Mind depicting a lot of visual hallucinations. They said they showed visual mostly for movie effect. I'm not sure how experiences vary by person.

I've thought I had other types of hallucinations than just visual or auditory, but I'm not sure if they were psychotic types.