Of the hotels I've stayed at on the strip, I would put them in this order...

1) Wynn (Simply the best - slightly more convenient and established than its twin).

2) Encore (See above).

3) Mandarin Oriental (high quality and sedate, but slightly inconvenient when I stayed there because they deliberately made it hard to walk to nearby locations to keep out the riff-raff).

4) The Venetian & the Palazzo (I put these two together because I honestly can't remember which one I stayed in.  The room was great, though).  

5) Four Seasons (Nice rooms, but you're at the end of the strip and Mandalay Bay isn't what it used to be). 

6) Bellagio (Great, but the rooms needed updating the last time I stayed there, which was several years ago).

7) Aria (Love the promenade areas, restaurants and the location's convenience, but the rooms are very cheaply done for how new they are; love the bakery and Ding Tai Fung).

8) The Mirage (It was actually pretty nice when I stayed there in the 1990s, but I recently revisited the lower level to play poker and it was awful).

9) Monte Carlo (Stayed there 25 years ago.  Whore magnet.  They propositioned me even when I was with my girlfriend at the time.  Defunct - replaced by Park MGM, where I have not stayed.) 

Of the poker rooms I've played... 1) Wynn, 2) Aria, 3) Bellagio, 4) Venetian, and a distant 5) The Mirage.