Yachiru Unohana's Bankai has been revealed and it seems to be a gas(considering her Zanpaktou turns into gas at some points in Shikai) that melts everything in the general vacinity including the weilder who has to heal herself(and Kenpachi) to live ability!

Barragan's Resurrección ability can age and deteriorate every object around him including the very buildings he walks on.

Who wins?