Currently, I'm leveling uo every DoM/DoW class/job other than WHM at same time.

For dps: Daily Roullete (low level) plus battlecraft levequests and beast tribes quests and Challenge Log XP bonus.

For tank/healer: Daily Roulette (Guildhest). Run the highest dungeon available.

Fates and Hunting Log for all jobs

I can't spend much time playing (college/work/family) so I try to maximize the available time.