>Both in their strongest
Perfect, then Bernkasel wins. At her peak, her conceptual nature of a Voyager (who is not just another witch limited to the Territory/A Witch that can manifest in the City of Books or things like those) allows her to reach even the boundaries closest to The Creator's room (as a law connected to the Creator).
In fact, beause Voyagers know what means becoming a Creator and are afraid of that, they limit their bodies and define their weaknesses, however as Voyagers they still seek the path to the Creator (which makes them Top-Tier in terms of evolution of the soul) and not only that, their law literally manifest everywhere and as a law of the world (Bern and Lambda, together, basically embody the world in the purest sense) she impose herself to Witches, and as the god of death (granted,
Willard was also said to be reaper but then again EP 7 is Bernkastel's Chessboard and she is the one who decides its plot, as seen in the end where she actually viewed Willard and Lion as pieces of the Chessboard), she acts and manifests regardless of the Witch's will.
She's just on a whole other level of power, and i'm not even mentioning the amount of hax she hax (honestly, Bernkastel is actually very downplayed in terms of hax on this site).