Opinions - Why do doctors choose to prescribe certain benzodiazepines over others?

SWIM has noticed that Valium is hardy prescribed anymore, and that Ativan is usually the most commonly prescribed benzo, but why? It is Swim’s understanding that all benzos are equally addictive is abused. Is Ativan not as strong as Xanax, thus giving it a lower chace of being abused? Is Xanax reserved for people who frequently experience panic attacks, because it is faster acting? And Ativan more for insomnia? I guess it depends on the doc, but SWIM does not really understand what makes them choose one or another when they all seem to produce such similar effects, with some variations.