Some Hilton properties define free breakfast as only coffee and a piece of fruit and a pastry so I don't see Hilton as clear cut as Hyatt or Starwood. You still need to look in order to make sure it is at least a full continental for some of them.

I like breakfast, and I will pick hotels based on which ones offer a better one. I know which Marriott properties give the full buffet on weekend in lounge or restaurant and which ones do not.