Shop Manual or FAM?

[Stocker]

Which would you buy, a factory shop manual or a factory assembly manual? Or both? So far I have never owned either and have figured things out or asked for advice. No big projects, mostly minor repairs or maintenance. I have basic hand tools and a carport to work in. Anything major ends up at a shop with real mechanics. But there are times I'd like to either do a bit more myself, or just be able to figure out where things are, what they are called, and how they work. Posted here for more eyeballs than in General, thank you mods for leaving this here.