Captain Benjamin Sisko, for many reasons.
1. He is the most layered captain of the franchise.
2. He was an excellent role model for fatherhood.
3. He understood that command means taking care of those under your command, and not just with logistics and life saving matters. He knew that sometimes you have to put on a smile and celebrate with them, even if it's the last thing you want to do. He was not a closed off or unapproachable leader.
4. He actually promoted everyone he could in a reasonable amount of time.
5. He was not afraid to get his hands dirty or do questionable things to serve a much greater good.
I've got other reasons, but this covers most of my main reasons.