I had an hour yesterday (Sunday) so I went to all three:
The Club: https://www.flyertalk.com/forum/35026661-post6.html In short, nice space with a lot of seating but really bad food options. The bar was open
Centurion: https://www.flyertalk.com/forum/35026631-post49.html The best food by far but no cocktails. Nice space and empty too
United Club:
A gorgeous space. I love all the natural light
Great food for a UC too. French Toast which I've never seen and a scrambled egg bar.