Wtf is that gif, did he break his own arm and now whipping it around?

No, he is using Baki nanchacks

I made this same poll before. Honestly i find them quite similar in strength and skills.

I am not sure but demon hunter verse has supernatural powers.

Mostly to do with the demons, the slayers rarely get supernatural abilities, and that's particular few, not even Hashira has them.

Yujiro is like unironically "ah yes, my convenient technique to counter this thing, haven't used it since the heian era" and gets glazed more by his verse, mr. sunshine sword guy is being bitched with all due respect to his skills. (i never watched either show)