All except the Shramjeevi are daily trains originating[GR originates alternately] from BSB. Most travellers choose as Shiv Ganga[perfect TT, LHB]>MUV NDLS~ Mahamana Exp[depending upon travel class>Varanasi GR>Kashi Vishwanath[too slowish].
I voted for the Kashi Vishwanath since it is the only ISO certified train amongst these, not to mention the overwhelming legacy it has.