Well not really a spoiler, but if you like moogles now dealing with all of the quests in The Churning Mist might change your opinion of them.
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Not really a spoiler, but I'll tag it as such:
One of the early moogle quests is called "Hide your Moogles" - that name should give you an idea what they're talking about. Do yourself a favor and concentrate on getting your aether currents first, only doing sidequests in that area if they're not out of the way, or have an aether current attached to them. You might have to google aether current quests in Churning Mists, tho, to know exactly which quests to do first (one of the aether current sidequests is gated behind another sidequest in the area). Being able to fly in Mists is a godsend for the rest of these quests - more so than other areas.
--Erim Nelhah
Honestly if you plan to take them both to 60, you should take your Nin to 60 first through the quests, then level your Pld through dungeons since it'll have instant queues over Nin.
Leveling 50 - 60 more than once is the biggest pain in the ass there is, especially for DPS.
I've only just finished clearing all the moogle quests in Churning Mists and I'm pretty sure it gave me a case of vertigo. Prepare yourself.
Just do both side by side. You'll reach points where you get left over quests when you hit a new level and can use them for exp on the other job.
This is what people think about the moogles.