Rocoline is the older system. It was a very complete geometry with many set track pieces, and flex track. It was available with and without roadbed. The with-roadbed version was designed to take turnout decoders underneath (so as to be hidden). When Roco went bust, a gentleman with intellectual property rights on Rocoline refused to accept the terms being offered by Modelleisenbahn (the resurrected Roco company). So Roco were obliged to create a new track range, Geoline, similar to, but not as complete as, Rocoline. I don't know to what extent the geometries are interoperable. After some years, agreement was reached, and Rocoline has been re-introduced.