From the 26th Century...
Archer, well without him there would be no Federation.
Picard, essentially your typical perfect Captain. By then though there would have been a few more Enterprises and captains. They'd probably be a general study of Flagship History altogether.
Sisko, practically won the Dominion War single-handed. So studying the Dominion War would have a huge chapter on him.
Janeway, would likely be the focus of the first chapter on the Delta Quadrant. Of course by then there'll be multiple galaxies to study.
So, Archer would be the most famous I'd say.