Honestly since the strengthening I'd put her above Da Vinci. Really though all I can really think is that this looks delicious.
I have both servants and can say that this is not even remotely the case
Da Vinci has at least a spammable NP and can survive a lot more (in the long run) than Scheherazade can ever hope to thanks to her (again) spammable 1st and 2nd skills.
In my experience, DV shines best in the 100 assassin nerofes challenge whilst Sche is a subpar caster in all cases