I’ve used both protectors.
Brand new game, Mylar goes down in the shooter lane, trough kick out power gets lowered. Does the job, keeps the clear from getting destroyed.
Then I wait for the Pinball universe protector to become available. Remove Mylar carefully and install the plastic protector.
All 3 options mentioned, work well. Love Cliff’s products, use them a lot. I like the simplicity of the plastic protector for the shooter lane.