What would you prefer as a biometric authentication system on the future iPhone ?

After you have replaced Touch ID, Face ID, will he disappear in its turn, in favour of a new Touch ID built-in under the screen ? This is the rumor, still very far from being above suspicion, who recently emerging. Face ID and Touch ID, they each have their fans, because they each have their advantages and disadvantages.

We can consider in one case as in the other, a more transparent system in the future. Manufacturers Android integrate since last year fingerprint sensors under the screen — and seek to expand it significantly, so that one no longer has to target a specific area. Face ID could also end one day or the other hidden under the screen.

Imagining that Apple will succeed in both cases to have a screen completely edge to edge, what would you prefer between Touch ID and the Face ID ?