I traveled with 4 different hotel chains in a single week, last week, booking 3 simultaneous rooms at each (1 for my wife and me; 2 for kids). Here's a quick comparison:

Marriott (status: Titanium): all we got was a grab-and-go breakfast with bagel and granola bar (instead of a lounge breakfast). 1 room only. Others got nada.

Hilton: (status Diamond + 2 golds); we got 3X $30 = $90 credit (which we used toward dinner). Gold status is trivial with Hilton -- we got it with Amex additional card memberships. My 16 yo is Hilton Gold.

IHG: (status: platinum): free breakfast for all 3 rooms: pancakes, scrambled eggs, bacon, muffins, yogurt, etc. This was HI Express, so status didn't matter.

Hyatt: (status: globalist): free breakfast for all 3 rooms (the cost would have been $190 +tip ordered from menu)