Board Thread:Naruto Discussions/@comment-30455007-20180203011536/@comment-734582-20180203091356

Itachi hated Madara and so made him look bad. Obito hated Itachi, and so made Itachi look bad. But Obito also hated Madara (although also impersonating him), so his version of events is a bit nicer but still bad.

In Itachi's version Madara straight up murders Izuna. In Obito's version Izuna gave his eyes willingly (but was still implied to be murdered by Madara). In the real version, Izuna was mortally wounded by Tobirama and so gave his eyes willingly.

Note that in Itachi's versions, Madara is cast in a far more unsympathetic light while Obito makes the Uchiha victims while making Itachi look far more manipulative than he was. E.g. Obito lies about the Kyubi attack, lies about Izuna's death and about Itachi's motives.