Besides the obvious choice (Tom!Peter) which Spiderman (Tobey or Andrew) is going to to feel a strong pull towards Grace (from the MCU) when they'll officially meet her? And vice versa? Which one will Grace connect with more? Whose story will tug at her heartstrings? Side note: Is it weird that for some reason I see Tobey giving off major dad vibes when he'll meet her, since he's the most mature one out of the three, and Andrew is going to act like the overprotective older brother? XD
Tobey!Peter will give off dad vibes xD The Grace from his universe is still alive, and although she still suffers heartbreak from losing Harry (she never quite 100% recovered from losing him), she has made a good life for herself.
Andrew!Peter is gonna feel a stronger pull towards MCU!Grace. It'll be because the Grace from his universe has passed away, and here's another Grace. Alive. Even though she's younger, and looks different than the Grace from his universe, their personalities are the same. She's stubborn, observant, caring, and lighthearted.
Once she hears about how much Andrew!Peter has lost (his girlfriend Gwen, and his close friend Grace), MCU!Grace is gonna feel so sad for him. So she'll connect more with him. She also brings up that there is a Gwen Stacy in her universe, and that she's one of the nicest and smartest people she knows. Grace will tell him how she used to have a crush on the MCU!Gwen Stacy. That even though that's not his Gwen he should know that no matter universe, Grace thinks that Gwen will always have a good heart.
This brings some comfort for Andrew!Peter.