Yes Golds often get upgrades too, quite nice suites they have. Some work on their 1st floor terrace now, so avoid room on the back of the hotel.
I either pick Radisson or Sheraton (actually it is a Luxury Collection now) when in Sofia, both are good but Radisson staff seems bit more genuinely focused on the customer and Sheraton staff can sometimes be bit arrogant (reception) or indifferent (housekeeping). Sheraton has more luxury feel to it though.