it's all up to you, if you're not fond of either job arcanist gives you then you can always start another class. you can also just stick with it and level it to max because there's an exp bonus called armoury bonus that any job lower than your highest leveled job gets by default. when you do daily roulettes most of the time it wants either tanks or healers for the bonus exp and gil, and scholar is a healer.
i started out as an arcanist/scholar and stuck with it ever since, but nowadays I usually run MSQ in expacks as a warrior for free armor and then max out scholar so i can benefit from daily roulette adventurer in need bonuses from either role.
I started playing around the tip end of ARR through Heavensward and mostly play pretty casually. I''m trying to level my gatherers and crafters after so long of putting them off and leveling some combat classes on the side.
i actually kinda want a geomancer mage class similar to the one in ff3 that uses bells