For all the luxury program affiliated travel agents on here, or to those who use the services often, (Amex FHR, Virtuoso, and Marriott STARS), in your experience, is there a general thought process as to which program bookings (at Marriotts) get priority for upgrades and general service?

Do Marriott properties prioritize their own program (STARS) first? Or does it vary widely by property/manager?

Thanks for any insight - I’ve always used Virtuoso but wondering if I should try to use STARS instead in the future when booking a Marriott hotel.