I was in Las Vegas last weekend and was surprised by the drastic differences between how the 2 companies approached the COVID precautions. Both companies advertise social distancing, reduced capacity at table games and slot machines as well as mask requirements. The approach each company takes on the casino floor is very different.
MGM properties have every other slot machine turned off or disabled. At table games, they have plexiglas dividers between each player space as well as between the players and the dealer. They have similar plexiglas barriers in the poker room. I still felt the poker room was too crowded.

Caesars on the other hand has every slot machine on. They are expecting players to not use a machine next to another player, but they are not being proactive. I saw multiple instances of players playing and sitting next to each other, so that isn’t working. Caesars doesn’t have barriers at tables or in the poker room, either. They have removed seats to limit the number of players at each game. Caesars seems to be taking a more staff oriented approach. They have dealers wearing plastic face shields in addition to masks, but there is nothing separating players..

MGM has also installed hand washing stations around the casinos and has stands with free disposable masks and hand sanitizer near the entrances. I saw hand sanitizer available at Caesars properties, but not to the same extent as the MGM properties.

Check in lines and hotel lobbies were also very different. The Bellagio had a lot of space available to keep distanced while in the check in line. MGM Grand also had a lot of space. Neither place was crowded when I visited. The Flamingo check in line was a mess. They did create some space to keep the waiting line away from the check in counter, but the line continued across the lobby and down the hallway. People in line were much closer than 6 feet. There were no markings to indicate where people should stand in the extended line. It was a hazardous situation. It also created a road block if you were trying to get from the casino to the Spa Tower.
We each have our own personal risk tolerances. The situations at Caesars Palace and the Flamingo made me very uncomfortable. I was happy that I was not staying at either place. It would have made for a very stressful trip for me. Unless things change, I cannot recommend staying or playing at a Caesars property in Las Vegas until things get better.
On the other hand, my stay at the Bellagio was really good and relatively comfortable given the situation. I would readily stay at the Bellagio or another MGM property during the pandemic if necessary.