Im not a moira main, but after fade buff, im using moira on junkertown the same way you pick lucio on illios or lijang.
I feel that map suits her playstyle the best plenty of cover, plenty of low highground spots for you to be a constant menance.
And that fade jump buff means i can quickly get back to highground or position myself.
Especially that third point you can climb to the centre rotator before too, but it took time, but now that you can go there in a sec means i can switch between harassing and getting back to team quickly while also denying any solo enemy taking that spot.
Whats your favourite moira map if any