Originally Posted by MahiMahi524

I had a lot of time to kill at LAS today (Sunday afternoon) and spent time in all 3 bank-operated lounges, so feel like I can give a pretty good comparison.

The one with shortest wait is the Capital One lounge. The wait at the Chase lounge is BY FAR the longest. There was a short waitlist for the C1 lounge at some point (but none when I entered). The AMEX lounge had about a 10 minute wait when I entered. The Chase lounge had a 1 hr+ wait for me to get in, and when I left, the lounge dragon told me some people have been on the list for 2-3 hours.

Here are some short thoughts on all of them:

Chase: The newest, so I think a lot of people are trying to check it out, hence the longer waits. Also, it is by far the smallest lounge of the three, and is probably 20% of the size of the AMEX lounge, and maybe 1/3 the size of the C1 lounge. It is the only lounge that has food-to-order.
AMEX: The oldest and largest lounge, so it is getting a little bit more run down. It is also the only lounge with a TV, so if you want to have a drink at the bar and watch sports, this is your only option.
Capital One: In between the two for both size and upkeep. It's still pretty new, so it doesn't feel very worn yet, but you can see it starting to show in some places.

In comparison:
Size: AMEX > C1 > Chase
Bar: All 3 have good options of drinks and cocktails, though I'm not a huge connoisseur. The Chase lounge has real Champagne as their special feature among their Sapphire lounges.
Non-alcoholic drinks: C1 > AMEX > Chase. C1 has a lot of various specialty coffee and soda drafts, while Chase has cans of drinks, and AMEX has their typical setup of tanks of various flavored drinks.
Food: Chase > C1 > AMEX in terms of quality, but Chase had fewer hot food options in the buffet. Chase has the collab with momofuku with potatoes and pork buns which puts them above the rest. AMEX buffet gets the job done and has the most quantity, and C1 has a variety of individually-portioned options of both hot and cold foods. C1 has a to-go area (but still only accessible once you are off waitlist).

Overall: If you have a lot of time to kill, you can check out the Chase lounge which is the newest and nicest but smallest. Otherwise they are all more-or-less equiavlent and go to the one with the shortest line.