Due to the lack of license from Ferrari, Lamborghini and many other teams, they are not present in the game.
This is why I prefer the Forza Horizon series (mostly to watch). You can find a lot of cars in that series. And all of the cars are very much customisable. Many YouTubers are making entertaining videos about this game series. They are fun and to watch.
If it is true you are right, I have played both games and Forza Horizon is more complete, however both were to my liking, I had a lot of fun with these games, I am a big fan of racing games, it is my favorite genre. Thank you for your visit and very accurate comment. Greetings!