Alcaraz vs. Sinner on Clay should be an amazing, even match. On Clay, it is pretty much even for these two players because most of the points will be dictated by which player can execute their plans from the baseline rallies better. While Alcaraz has more of the firepower and variety shots than Sinner, Clay will neutralize some of those firepower and if Alcaraz does not execute his dropshots well, then Sinner will able to reach those dropshots. With that being said, Alcaraz is still a great young player, so he will be tough to beat even on Clay.
As for Sinner, interestingly enough, this is his 1st ATP Tour on final on Clay. He was unlucky in the past year or so in facing Nadal (3x), Djokovic, Tsitsipas, Zverev on Clay before the final. In addition, with his injury problems this year, this probably a good feeling for him to reach the final for the 1st time this year. I am curious to see on what Sinner's team will come up in terms of strategy. It will definitely be different due to the surface, but in addition, Alcaraz will definitely play better and differently.