Forza 4 or 5 ,which first Xbox Series S?

[wattsndrive90]

Been an xbox player since 360 but oddly enough only played the 2nd or 3rd on 360 which by that point the One was heavily being used so never finished. That all said 4 and 5 are both optimized for X/S but no idea which is better to start with - only thing I can tell right off is 5 has the bigger install size. Input please. which is more fun, best graphics, performance,etc?