Why not both? Having an actress with breasts doesn't mean the script will be bad. In fact, we've seen for years that movies, TV shows, and games that try to soften these attributes in the name of inclusivity often end up being dogshit because made by people that care more about politics than writing something actually good. Have you seen the Tomb Raider Netflix show? It's terrible.
Lara Croft in SOTTR (which is terribly underrated IMO, best Tomb Raider since Anniversary) was still very feminine btw, far from "flat as fuck".
So yeah, give me someone like Rhona Mitra because if the writing is actually bad, I still have something to look at rather than Sophie Turner who, in addition to not being a very good actress, has no curves