It was an interesting twist to have Nog (instead of Jake) wanting to join Starfleet.
This. I thought it was an excellent move, especially how Sisko started out feeling Nog was just a bad influence on Jake. It would have been too predictable to have Jake do it. It definitely kept Jake from being Wesley Crusher Jr. (not that he was really on that path anyway) and though having Jake not go to Starfleet was a unique way to go, it also make him kind of useless on a show about Starfleet Officers.