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That was a translation error. The Viz translation Kurama compared Sasukes abillity to make a Gedo-Mazo esque Susanno was on par with Hagoromo. Nothing about strength.Naruto won just because plot, Sasuke was on a totally different scale, Kurama himself admitted that with the Absolute Susanoo Sasuke was on Hagoromo level. Naruto also needed two of his strongest jutsu (wind) to counter one Indra's Arrow (lightining). Sasuke could have also infused the arrow with Amaterasu to have an advantage against wind but hey, the manga is called Naruto afterall.