For cycling rock the salt mix brand/blend is not critically important.
As
@UMALUM said, down the road using a mix that provides the parameters (Alk,Ca, Mg, et ct.) that you want for your critters,fish & coral is important for stability when making water changes. When you start the salt mixture isn’t critical but it is something to figure out which salt will serve you best for the livestock you want to keep.
As the rock is settling in the next addition you might want is a clean up crew and micro fauna like copepods & amphipods to get the ecosystem basics in place before you add coral or fish.
Are you going to start a build thread to help keep track of your steps and progress going forward?