As the molecular weight/ density of all chemicals or reagents are different, so you can't get similar result from both w/w% and molar calculation. For making stoichiometrically equivalent of all solution, its better to use molar ratio if you are not recommendate for using w/w%.

Good day. It is better to work with weights (w/w or mols); with volumes (v/v) is tricky: there are different volumes for every temperature. Much simpler is just to weigh instead to recalculate in addition.

Both are accurate.  They're just different ways of expressing the same thing.

Yes both are correct. As stated  by prof. Alan.

Regards