The quests for the base classes (1-30) and the Jobs (30-70) are kind of separate stories with little connection... So it might be better to think of them as separate stories...

PLD is definitely at the very bottom of the list, and I think the writers even acknowledge that as they went back to the GLD storyline in Stormblood's Job quests rather than trying to continue the PLD one.

But for good ones, the SAM story is a pretty good one.