There aren’t many advantages to Mylar other than it possibly was the original. They are cheaper. Slightly easier to install maybe but I’ve found that isn’t always the case a bubble seems easier to create if I have to get the heat gun out to remove a bubble most likely it’s a Mylar decal. If you use soapy water under them it’s possible to see some residue through the clear parts of the decal too
As fixing Farmer pointed out the mylar are original. I think that they look better and last longer. The advantage of vinyl is you can get a sign shop to c ut you out whatever you want. You can even get your own cutter for under $300.00 and make your own.

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