Vicario would appear the more natural tactical fit for a club that values structure and control. He is widely seen as a sharp shot-stopper, quick off his line and comfortable working behind a defence that does not want to sit deep for long spells.
There is also the question of adaptation.
That matters for a club where mistakes in goal are magnified immediately.
Martínez, though, offers a different kind of upside. He has built a reputation as a goalkeeper for high-pressure moments: vocal, aggressive and difficult to unsettle. For a team needing personality as much as technique, that carries real value.
His case would likely rest on three things:
The trade-off is stylistic. Martínez can be more front-footed and emotional in his game, and that profile is not always the one every coach wants as the foundation of a controlled build-up side.
This is why Vicario may look like the cleaner option, while Martínez may look like the bigger statement. One is arguably the safer squad fit; the other the more forceful personality.
The next step is whether reports develop into something firmer as squad planning continues. Until then, the key storyline is simple: do Juventus want familiarity and fit, or authority and edge from their next goalkeeper decision?