All great choices. Mgm doesn't have tight security at the elevators and also has monorail access for sight seeing or getting to and from the Eastside of the strip.  Caesars is also nice but to me feels super stuffy, has a great poker room if you gamble. Wynn always is wonderful choice if you're a foodie. They also cater to clients with dietary issues and the chefs go above and beyond. Hope that helps a bit.  

Personally, my choice would be Wynn.

Not knowing your budget here are two choices at two different price levels. The higher price level is the Venitian/Palazzo. Good location, large comfortable standard rooms. A variety of food choices both high end as well as a food court. Still no parking fees at this property.
The second and in a lower price range is Bally’s. An older place, large standard rooms and a good center strip location. It is also connected to Paris (another Caesars property). Food choices (of course just my opinion!) aren’t as good as the Venitian/Palazzo. I have stayed at both places numerous times and have never had any issues with either. Good luck!

Xoxo

I tend to stick to these 3. Depending on whose got the best deal. Caesars is my favorite for hobbying . Room keys haven’t been needed to access the elevators every time I stayed there.  

But they’re all great and treat their guests fantastic.

The Aria is great also!

I’m an older guy but very active and prefer the Encore. The Encore has mirrors, is more quiet and has the Sinatra Restaurant where a suit is preferred just outside the private entrance.