Originally Posted by MSPeconomist

Are you primarily concerned about elite benefits, points earning or nights credit toward future elite status?

IIRC Hilton Gold (and also Diamond) give free breakfast to room occupants in most brands, but Diamond might give lounge access, better upgrade chances, and a late(r) checkout if available.

With Marriott, Titanium gives a guaranteed 4 pm checkout (with some exceptions, namely for resorts and properties that are designated by Marriott as conference hotels) and a complicated free breakfast benefit, plus upgrades if available at check in. These generally wouldn't extend to the second room but properties sometimes choose to do this voluntarily.