Re: Been there, done that
Personally I'd go with captain janeway. First of all, when blasted to the delta quadrant with no way home, she not only kept her crew together, she managed to unite two opposing factions who effectively wanted each other dead.
Then under her command they continued to make their way home as best they could, while taking on the freakin' borg. The borg who were able to eliminate several of starfleets most advanced ships with a single cube, and during their travels, janeway was able to take out numerous borg cubes and spheres using her single intrepid class ship.
Even better? Not only against odds does she take out a random cube here or there, but with a little help from the inside she WIPES OUT THE BORG!
The single most dangerous enemy to date, and janeway wipes them off the face of the universe. One leader, one starship, vs a collective of millions of minds, with thousands of ships each of which was more deadly than the voyager. And she wiped them out.
If anyone were an inspiring leader, it's her.