Do you mean Poser or do you mean the Poser community?

There is no real difference whether content comes from the developers of Poser or from 3rd. parties, except that Poser native content can expect a more broad userbase because it may come with Poser.  

A small selection from my personal preference top-X of Poser improvements:

• managed Runtimes, a sort of vault, with consistency check during installation and database indexing, reference to help information, and so on.  

• a highly improved cloth room, much like Marvelous Designer, but with better support for appendages (buckles, stays, straps).

• partial pose file loading options (use body translations yes/no; expression morphs yes/no; body morphs yes/no), and application by percentage: a small slider allowing you to apply a (morph) pose for 53%. 

• undo thread by figure/prop

With regard to content:

• native non-generic non-standard figures: a gnome with short curly legs, an obese man/woman, an ectomorph man/woman; all with dedicated riggen and weight mapping. Why sacrifice on bending quality of the average proporioned figure because 'there is a crease when bending with the heavy morph'. A fat body bends differently from a slender one, so make them different rigs?  

There are enough perfect adults. Time for the non-perfect.