Caucasus Mountain Bees are supposed to be the most gentle in the world. But chuck them in the desert, they might get ornery, too.
I have found Italian Queens bred in Texas to be my most predictable in behavior hives. I twice bought “Caucasian, and Carniolan” queens for hive re-queening. They are marketed as docile. I found nothing could be further from reality. The hives became dangerous to the neighborhood. One lawn mower two hundred feet away would but them on alert.