I've got Grasso.
Calderwood is a long fighter, and she's skilled. But she's slow, both in terms of actual physical speed and in terms of her preferred fight pacing. I see her as a gatekeeper rather than a contender. The girls she beats for the most part don't really belong in the UFC. The girls who beat her for the most part do.
Grasso is faster, and her boxing has really been coming along. I think her footwork is better than Calderwood's. Calderwood is a big step up for her in terms of experience, but the girls Grasso struggles with are wrestlers.