Grimmjow has super speed and with his incredible power not even Hollow Ichigo could hope to stop him! Hollow Ichigo is an impressive being, but in the end he’s just not at Grimmjow’s level. Grimmjow is an espada and is used to pwning. Grimmjow rises up the ranks with this win and reminds the world of his true power. Grimmjow wins.
Update 8 7 2020. Hollow Ichigo possesses a lot of the same strength as Ichigo and would be able to claim victory here. Hollow Ichigo wins.