Cycles and Eevee are two very different render engines with to very different target audiences ...... sort of. What I like best about Eevee is it gives me realtime feedback of Eevee or Cycles shaders (for those that are the same). For projects where Eevee works, it's awesome! Think of doing an animation at 1080p with high a quality "PBR" renderer at 2-3 seconds a frame - that's what Eevee can give you (view port rendering is almost instantaneous). However, so far it seems to fall short with very large complex scenes (and poorly made models with polygons that are parallel and very close together), where Cycles shines. My understanding is that Eevee is an OpenGL renderer (I could be wrong).

With respect to Poser, I doubt Eevee will ever come to Poser. I don't think it has the same liberal licensing that Cycles has.

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