Your question is hard to answer. There are a million and one brand standards at a Marriott alone.

TV sizes, mattresses, bedding, electrical outlets, toiletries, bibles/BOM, recycling, food in the lounge, elite recognition, bars, room service, doormen, and the list goes on.

As to the toiletries, domestic Marriott's have Thann, Ren's have Aveda, and JW's have Aromatherapy. Rooms on the concierge floors have more toiletries than rooms on regular floors. Sometimes they have soap, sometimes they have bottles of hand wash or body wash.

For 2017 YTD, I'm at 95 actual nights in legacy Marriott properties and 27 nights in legacy Starwood properties (that doesn't include any rollover nights/etc). I'll notice inconsistencies (particularly on elite recognition at both Marriott and Starwood) but toiletries seem to be fairly consistent in most hotels. Often, I can immediately recognize that something doesn't meet brand standard or when it exceeds the standard.

And Seattle's Best -- embarrassing! Of course, I'll note that I was at a Westin property recently with a lounge and they had a Folger's machine!!!