Quick question about where to go next!

I'm currently level 15 and just finished the lighthouse quest in western la noscea and I got my Marauder class quest that's taking me to Aleport (it's level 15 area I'm assuming) but also just got a quest that sends me to help build an airship to the south (level 11 or 12 quest). Should I go to the 12 area first so I don't skip it or just go straight for Aleport? Thanks!

Well - in principle - the later you get to the lover level quest (with already higher level character) ther less reward you'll get (this is mainly for leve quests and indeed any points for mobs killed). But you of course don't need to follow / complete the quests stricly in the level order if it's easier to take them as you pass around.