I don't know women's tennis all that well, but always had the sense that she has a higher ceiling that Sabalenka who is a great player, but more the type who is #1 when the very best player is struggling (Swiatek) or when the younger up-and-comers aren't fully in their peak form yet (Andreeva, maybe Gauff).
I think it is fair to say at this point in time when Iga is on her 'game' like she has been at Wimbledon this year, with no pressure, remember she hadnt won a title since the clay season last year, also a new coach in Fissette, she does have a higher ceiling, especially in GS finals compared to Sabalenka, though I have always said if Sabalenka can watch her margins most matches are on her racket, her emotions let her down, eg at the RG finals this year, she always plays with her heart on her sleeve
Iga has always been a great front runner in matches and she was just ruthless today in the final from start to finish, in saying that Amanda was shell shocked and frozen, nerves got in the way.
Mirra is now playing the tour full time, she is coming to terms what it is like to handle pressure, a good learning curve for the 18 yo who does have a great game with variety, no she hasnt reached her peak as yet.
Gauff and grass have never been a good combination, she went out in the first round this year to a player ranked in their 80's, so did Paolini who was a finalist last year at Wimbledon, I always thought Gauff has the game for grass, she just hasnt been able to put it all together as yet