User blog comment:B214/Volume 21 info & spoilers/@comment-83.22.168.173-20160711150248/@comment-26345952-20160712220919

@anon they are talking of the fights within DxD universe.

But about your suggestion, if that were to happen I say Goku and Vegeta would win. The DxD mode regardless of wich one is an ability that they cant use for too long. Hoku and Vegeta can maintain their SSGSS (Super Saiyan God Super Saiyan) gor a good amount of time, when Issei and Vali (especially Issei) cant maintain their DxD form for probably a minute or so, maybe less. And if they know it they might use that time for thwir advantage, or at least Vegeta would (Im not really up to date wuth Vegetas attitude).

Bottom line the Saiyans would win in my opinion