Screen Protectors or Tempered Glass?

I have an iPhone and I have been using a Screen Protector Film for my Screen, but Im wondering if I should switch to a Tempered Glass instead? I like my current Screen Protector cause its Matte and also has self-heal and Its not that I dont find the protection sufficient enough but lately, Ive been getting multiple suggestions to switch.
I would like to know the specifics.

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