I hardly ever get a room upgrade at a full service Hilton as Diamond beyond being on the HHonors floor but I have had some really excellent room upgrades at Hilton Garden Inn and even the "Suites" at Hampton Inn & Suites but even after upgrade it is still a Hampton or HGI as far as amenities if you want in hotel food/drink, care about thread count etc.

I am PC Platinum and it is pretty meaningless because the on premises benefits are minimal and the quality of the properties is much more variable than Marriott or Hilton.

A Hyatt with no status is often nicer than a Hilton , Crowne Plaza or Marriott with status but there aren't enough of them for me. Same with SPG.