I stayed at the Encore last July and IMHO the Encore King Suite was nicer than the rooms at the Wynn.
It was very hot, and walking around suddenly was not fun (and I am in better shape than most 60 plus).
The Encore casino had more high limit tables and I spent my playing time in the Wynn casino.
I am planning some trips for June and July, and will either stay at the Wynn, or the Palazzo.
The hike to Encore is not worth it.