Board Thread:Versus Debates/@comment-43403813-20191027002638/@comment-32685487-20191027004919

Deidara confirmed that Sasori was stronger himself, same way Kisame said Itachi was stronger than himself too. Sasori was capable of somehow killing the strongest Kazekage before Gaara so Sasori being stronger than Deidara is believable, Deidara has no reason to make that up.