Best for what? You'll get lots of argument on that. Depends mostly (in no particular order) on your computer power, your budget, and what kinds of things you intend to do with it. A key datum is that some figures are more supported than others, in terms of clothing, character morphs, textures. Depending on how clever you are, however, much can be converted from one figure to another. The figure of the day is Victoria3 from DAZ. The base package is free. Lots of free textures, hair, and clothing. Free scenery. If what you want to do is (typical?) figure-posing-in-a-temple pics, you can pretty much get there with free stuff. Well. To head off the inevitable "Jessi has a nicer face/Apollo's joints are better/V4 is coming soon/everyone is using Aiko3 now" rants, let me ask, quickly; What is it you want to do with Poser? The more specific your intent, the more informative people can be towards helping you achieve it.