Z-moves > Dynamax > Megas

>Z-moves
-Any pokemon can use it
-Is beyond a power-up, with how it plays status moves
-Just 1 turn gimmick, isn't an automatic win
-You need to use your brain to efficiently use your Z-move

>Megashit
-Just a few pokemon can use it
-It power-ups mons that were already broken
-Breaks the game lasting forever with the pokemon
-No complexity, even babys can win a battle just pushing the mega button

Dynamax its between those but much more acceptable than megas