Didn't Tobirama kill Izuna?
Well Tobirama beat Izuna pretty easily so I would say so, unless you've got a good argument why Izuna would be stronger.
Hebi Sasuke also beat Orochimaru quite easily, does that make him the stronger of the two? Absolutely not. Capitalizing on your opponents weaknesses doesn't indicate who is stronger.
On Topic: It cannot be certain but Izuna being the Second Mangekyo user makes it even more uncertain.
So basically people most not aware of the fact that during their last fight, izuna already gave his eyes to madara. Before that, they were all draws
That happened after tobirama cut his chest open.So basically people most not aware of the fact that during their last fight, izuna already gave his eyes to madara. Before that, they were all draws
All the reference given that when madara took izuna eyes, izuna was healthy, far from being dead or blind