The spit shine to Budgie is more realized than Plasma I think, but...
Not being able to be rid of that bar at the top of the screen was the deal breaker for me. Presumes too much of how I want to organize my workflow and visually was too distracting.
Plasma is maybe less refined (at least with my hit or miss attempts to personalize it), but I think that is mostly not being familiar with it.
Really boils down to what do you want. Do you want seamless integration? Budgie has got it going on. Do you want the ability to make your doodads just so for what ever use case? Plasma removes the guard rails to your ambitions, for better or worse.
MATE absolutely rocks for laptop use. I haven't tried GNOME.