Well the term 'best' is touchy, but for your use case I'd suggest trying SVN using something like VisualSVN Server and TortoiseSVN for the client(s). Simple to

Well the term 'best' is touchy, but for your use case I'd suggest trying SVN using something like VisualSVN Server and TortoiseSVN for the client(s). Simple to set up, understand and use.