I'm mainly comparing shaderlight, podium, twilight, and a couple others in this range and between shaderlight and podium I haven't really found any huge differences and they are the same price. I have just grown used to having a huge library of pre-made fixtures and it saves a lot of time lighting a model especially when the architecture is not the focus of my models.
Having 350+ light fixtures that are very well modeled and preconfigured with lighting that I can throw in is a pretty big bonus for me. There is also a nice selection of other high quality materials and components. It may not be a deciding factor for some people but when everything else is pretty much the same it might be.