I've always preferred the original 3-mountain version. In the new version, not only did they remove a mountain, but they took out a lot of the color. The palm trees no longer have any bark, and the leaves are no longer shaded. Likewise the mountain shading is gone, as is the shading on the Mickey figure.
In my opinion the old 3-mountain logo had definition, color and clarity. The new one is more bland, and the wording on the outside of the oval has gotten more bold which also diminishes from the oval logo itself.
Werner's side by side comparison makes it easy to see all the subtle, but detracting, differences they made.
My guess is they wanted to simplify the color schemes and reduce the detail to make it easier (this means cheaper) to put the logo on printed materials, merchandise, etc.
Just imho.