I posted on the Website issue thread a couple times about this, but as I have looked further into it, I think it deserves its own thread.

On multiple occasions / destination searches, the website is not showing a lot of available hotels in the results.
I spent a lot of time making sure filters were cleared, cookies/cache, etc but hotels I expected to be there did not show up.
I then went to the app (which I rarely use for hotel searches) and bingo, everything showed up.

As an example, searching London for 3 nights around New Years, the app has 54 results and the website 27.
Missing from the website results are major hotels in the city center such as

• W London
• London Marriott Hotel County Hall
• St. Ermin's Hotel, Autograph Collection
• Bankside Hotel, Autograph Collection
• London Marriott Hotel Grosvenor Square
• and many more

On other searches, the Cologne Marriott is not showing up on the web, but does on the app. Marriott Georgetown now showing up in Washington DC. Marriott East not showing up in Indianapolis.

Can others confirm the same thing is happening with their website searches?

I much prefer using website for searches / trip planning as the screen size is so much better. And can have multiple windows open to compare.