I used to export .obj to the standalone from Carrara before there was this plugin, but I've since moved back to Poser, because the plugin is really a time saver as opposed to doing .obj exports all the time. With all the features the plugin has and continues to get, there is no point in using the standalone anymore, especially if you're using Poser props and figures. You can go back and forth editing and tweaking, and you see what you're doing in Octane in real time.
My $ 0.02.
Win 10 Home x64 / NVIDIA GeForce GTX 1070 8 GB / (Intel i7 2.8 GHz) x8, 16 GB RAM / PoserPro 11.2