If you already own the Chilton's guide, buy this. If you don't, buy this instead. They're both good by themselves, but the Haynes one seems to cover a bit more and explain it a bit better. Additionally, the Haynes one covers the Legacy specifically, while the Chilton guide tries to cover the entire Subaru range for those years, making it a bit more complicated to deal with if you don't want to wade through Justy and SVX-specific stuff. The only things the manual could have used were more detailed info about bodywork (though the dent repair guide is pretty great for only two pages) and the ECU, though I know both of those things changed a lot between '90 and '99, so I don't really hold that against Haynes much.