As with the other replies, the flamingo is a better location although I didn't mind the walking. Different to others, I didn't think much of the pool in ny ny, I would say the flamingo is better pool wise but I have haven't stayed there or swam there. I like the pools in the Bellagio and Elara.
If you do stay in the ny ny, the duelling pianos bar and the Italian steak house are excellent.
Elara is excellent........also sits above the Miracle Mile shops and the Planet Hollywood Casino.