For the answer to that, you'd need to talk to someone who has used all three programs -- I haven't used Max or Maya.  Keep in mind that you are talking about a considerable price difference there.  Plus Max and Maya aren't just modelers -- they are also animation programs, etc..

I can say that I know of 3DS Max users (at least one in this forum) who prefer to use Modo over Max for strict modeling purposes.  They find Modo to be easier and faster to use in the sense of fewer clicks & clearer commands to accomplish the same job.  Afterwards, the model can be imported into Max (or whatever), if desired.

I've also read of other highend users preferring Modo (strictly as a modeler) over Maya or the others.

Ultimately: it's largely an individual thing as to which software you, personally would prefer to use.  There's no such thing as a single, "ultimate" 3D program.  Each one usually does certain things better than the others.  It just depends upon where you want to go.

For a combination of Poser compatiblilty coupled with sheer power and ease of use I'd recommend Modo over the others.  At least if Poser compatibility is a major consideration: and your goal is to make content for Poser.

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