Does anyone know what the differences are between the Metal Build / GFFMC / Metal Robot Spirits lines are? I actually have a couple but I can't really figure out what the differences between the lines are. The gundam.fandom.com wiki says the Metal Build is more 1/100 scale versus Metal Robot Spirits being closer to 1/144 scale (not sure what GFFMC scale is), but other than maybe a potential size difference, are there any other differences between them that I should consider when choosing a model in one line versus the other? All I know is regardless they are all very expensive!