Yh but that was mentioned in part 1 so take it with a grain of salt. I mean does anyone actually believe that it would break Susanoo? It would be like saying Neji's gentle fist could negate a Rasengan or Chidori by releasing chakra from his tenketsu's in his hand and give Naruto and Sasuke High fives instead. Draw the line. Any Hyuga's power would have been shown more prominently if gentle fist was as strong as that statement says it were to be.
I feel like the Hyuga got DbZ'd by the uchiha once itachi showed up lol. Like in part one they implied the hyuga to be extremely overpowered. Ninja antimeta. Lock down every ones ability to use jutsu. But I think they implied the gentle fist instep is instant, meaning neji would be able to stop naruto or sasuke from using the chakra to form chidori in the first place. We didnt see much hyuga in part two, but there was still the impressive feat of rotation blocking the ten tails.
Well, had there been any "Bankakyō Byakugan", that combined with Gentle Fist would most likely be more effective.
But since there isn't... I would say from ribcage version to half-body humanoid Susanoo are the most susceptible to Gentle Fist. Armoured and fullbody humanoid versions would be more difficult and Complete Body — Susanoo would naturally be the most difficult.