At the Harris County Psychiatric Center in Houston, Texas, where I was prescribed Haldol, a disproportionate amount of other people were on Haldol too.
At Burnaby Hospital in Burnaby, BC, Canada, EVERY patient in the psych ward was on Loxapine and Risperdal, save 2 or 3 people. (I was on loxapine as an antipsychotic and Risperdal as a sedative, the others were on Risperdal as an antipsychotic and Loxapine as a sedative). One of the two or three people who weren't on Risperdal or loxapine was on Zyprexa, and they were also going to put me on Zyprexa but I told them about the side effects. So Zyprexa is their third-favorite antipsychotic.
At least the Celexa thing is constant... everywhere I went and everywhere I heard of, Celexa was (and is) the first antidepressant they give you.
But with antipsychotics, the first choice varies with the place, and each place has their own preferred medication to give their patients, but they each have one medication that they give almost everyone.