Madara or Indra I'd say Madara because he's had time and took on the jyubi's body(hashirama).
But Indra is also a possibility he took on RSM Ashura and would've likely had all ms techs.
Stupid comparison, Indra is an Otsutsuki and inherited his Sharingan powers directly from Kaguya's genes, EMS is literally fodder compared to his own.
Uchiha incarnates only have a fraction of Indra's power, it's nowhere near the level of Hagoromo's first born. It wasn't until Sasuke had Rinnegan and the 9 bijuu that he was able to perform avatar feats comparable to the Uchiha progenitor, that should tell you how OP the Sage's children were.
Who has the better personality
Indra because he had Itachi's genius, Sasuke's confidence and Madara's desire
Indra because he had Itachi's genius, Sasuke's confidence and Madara's desire
Proof
That came straight from your ass
Proof
That came straight from your ass
Hagoromo called him a genius, a genius by Otsutsuki standards is levels above any human, that's what Itachi was and Sasuke emphasized that when he gave his speech to Orochimaru "the greatest genius is average compared to Uchiha"
These ^
Hiruzen, Itachi and Neji were all called genius, but the three of them are completely different people. You can't infer one's personality from that alone.
OT: Indra obviously in power, Madara obviously in personality. We don't really have anything to compare on personality after all, except the filler...and that Indra is just a dipshit through and through to be honest.
"My first born was a genius and had powerful eyes since birth" - Hagoromo 2015
"The greatest genius is nothing compared to Uchiha" - Sasuke 2013
Read the manga before calling people out