Neither!

Why not a in between?! "
Adjust the skills/abilities where for the basic classes these are, your role is defined. As you progress laterr on if we add advanced classes you can go to a certain specific for that class and focus on that. Or maybe the specific roles of jobs added later on separate then these. Kind of like FFXI for second option

Example of first option:

Conjurer(Define as a white mage in this example)==> Rank 50 3 choices:

Conjurer=>Healer
Conjurer=>Enhancer(party buffer)
Conjurer=>Priest(Enfeebling)

now you keep all the skills you have till 50 of course, but you pick a speciallization where you will get strong moves under that category compared to the others. Like If I pick a Healer I will get strong healing moves, but not as good party buffs if I had picked a enhancer or not as strong offensive moves like Holy if I had picked Enfeebling.

Like it if you agree with something along these lines!