Poser was my entrance into the 3D world and I am currently learning Maya. Really I think it boils down to what workflows works for you in order to meet your deadlines. I have decided to take a two year detour to graze over Maya's features (which require you to forget everything that you've previously learned - after that everything's pretty easy). It seemes that some things that can be done easily in Poser require several steps in Maya. But overall Maya could offer you more power and control for animations, is a more complete package and is more marketable if you're looking to join a studio or something.