Probably the best analysis of both Alcaraz's and Sinner's games right now. Just watch from the 30 minute mark until the end. This is how I describe their games too.
Rafanoy,
You said you thought Alcaraz serve was better than Sinner's though Gil Gros does not agree with you, I have to agree with Gil, Sinners' game against Alcaraz was the best match he played, so far this year ,at Wimbledon, a surface Sinner has not done well on, I dont know if you watched it, if you can watch it I suggest you do.Agree with Sinner's running fhand as well, it has been outstanding.
Darren Cahill has said Sinner, needs to work on his serve, also his transition game to the net more, which I have already stated, he needs to get more physical strength, he can win GS slams, in the coming years, as he is a hard worker and has a strong work ethic.