Mugetsu Ichigo
Hollow mask Ichigo vs Segunda Etapa Nero= 53/47 to Ichigo's win
Bankai Ichigo vs Resureccion Nero 50/50 tie
Shikai Ichigo (after learning its name) vs Resureccion Nero 45/55 to Nero A very difficult fight.
Same as previous Ichigo vs no Gigai Nero 60/40 to Ichigo
Ichigo upon first arrival to Soul Society vs No Gigai Nero 37/73 to Nero (Nero would steam roll Ikakku when the guys first introduced.)
Ichigo now vs No Gigai Nero 15/85 to Nero
Ichigo now vs Gigai Nero 72/38 Ichigo (The Gigai is a powerful restrictor but Neros experience makes up for it.)
Ichigo is stronger overall but Nero has more experience and his strength is nothing to laugh at.