I guess it depends on when you found Star Trek. For me Sisko was the guy I followed each week from start to finish. So he is my first pick even though he wasn't a captain to start with. Then upon going back and watching the other series, I would add Kirk and Picard. So it would be Sisko, Kirk, then Picard. I would also throw in TOS Pike, I liked his first episode and would have been fine following him week to week.