What you have to remember is its originally Itachi's technique so of course Itachi's version will be better for a while until sasukes fully in control of it but just like chidori he learnt from kakashi he will add to it and make it better suited for how he will want the technique to work to better fit his fighting style so i say yes it will end up better then itachi's. sasukes susanoo may end up getting the weapons Itachi's one had maybe not tho as kishi may have wanted those weapons to remain only unique to Itachi's susanoo which i think is a fitting decision as they wont seem as epic if sasuke keeps busting Susanoo out with the Yata Mirror (The shield) and the Sword of Totsuka.
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