Im making this post due to people ALWAYS giving Itachi and Minato crap
Im going to put key features and abilities for both users starting with itachi and then we will discuss things.
Also I will prove that Kushina actually did more for Naruto than Minato has since that will be most peoples Arguments.
Itachi Key Roles:
Killed Uchiha Clan and saved the Village from being completely overrun by Uchiha Clan (Help from Obito/tobi
Haulted the progress of Obito/Tobi due to him fearing Itachi
Stopped Edo Tensei making him the Hero of the War and thus allowing the Alliance to fully Support Naruto
If Itachi didn't stop Edo Tensei Obito/Tobi would have captured bee and Naruto using the other Jinchuuriki
Acknowledged by the God of Shinobi himself as being a Better Shinobi than him
Planned his own life to make Sasuke into the Epicness that he is today
Saved Naruto and Bee from being Captured by Pein/Kabuto.
Made Sasuke good again through his actions and removed the Curse seal / Emo Seal
Minato Key Roles:
Saved the Village from the nine tails attack at Naruto's Birth using Demon Seal (Helped by Kushina)
Defeated Obito/Tobi at Naruto's Birth
Sealed up the nine tails again during Naruto vs Pain Battle
Warped a Tailed Beast Bomb ( http://narutobase.net/forums/showthread.php?t=373923 )
Learned Jutsu from Kushina to allow Naruto to control the nine tails
Now I want to discuss Abilities:
Highly Advance Genjutsu (Users are in a Genjutsu about being in a Genjutsu)
Invincible Susanoo (Sword of Totsuka and Yata Mirror) (Proven in Manga)
Genius Intellience >= Minato
Most Keen Eyes in Uchiha
FTG + Kunai Tags
Demon Seal (Epic move but at the cost of your life)
Genius Intellience >= Itachi
With this being said I just would like to say that through pure Manga facts alone we can agree that Itachi was a greater shinobi than Minato.
Now before people talk about how Naruto has BM modes because of Minato... Lets not forget that it was Kushina who actually assisted Naruto in getting BM AND before any one complains about how Minato was the one that did the seal lets not forget that it was Kushina who taught minato the Seal.
One key thing I want to point out is that Both there fighting styles are exactky opposite of one another since Itachi prefer Genjutsu and distance.. Minato is close range taijutsu/ point of contact jutsu. With this being said I dont care about fighting im referring to overall greatness and achievements.
In a Fight though I have always been one to say Genjutsu > All other and Itachi is the best genjutsu user in the series Overall
EDIT: Minato Admitting he failed as a hokage and also Orochimaru stating that everyone wanted him to be hokage over Minato