Tales of Adventure MSQ and Job Level which one to do first?

[Sebille]

If I want to level a job to 70 and also complete the main story quest to Shadowbringers, does it matter which one I do first?

I'm a veteran MMO player and I would prefer to save time.

Oh and I was strongly considering Scholar or Summoner as the job to level, but I am still open to what job.

I played a Red Mage in FFXI, up to level 11 or so.. what a difficult game that was.