The DBS (510 HP) is the higher performance version of the DB9 (469 HP), i.e. their V12 touring car. The Vantage is smaller and lighter, currently only with a V8, but the V12 Vantage, if it gets made, is supposed to get the 600 HP V12 from the DBRS9 race car, while still in the smaller Vantage footprint, it's a beast.