About Nekro

[Ydra]

I've been thinking about opening a Nekro (maybe should've done so a long time ago).
From what I've heard, Nekro seems to be most versatile pet, the best for PvE and for PvP, at least for a warrior, but have also heard great things from rogues and mages.

Is Nekro really all people say it is?

Because from experience, the other eggs (e.g. SnS, MM, Mishi, recently Glowstik) all seem to be more sought after, and thus more expensive.
Could someone explain?
Is this due to rarity of the eggs, their actual stats, or something else?

Thanks for all the input in advance.