Is it better to invest in altcoins or driverless trams?

In the morning, it takes me to work, and then it drives a ride-hailing car; in the evening, it picks me up after work, and then it continues to drive a ride-hailing car. If it runs out of power, it can charge itself. It makes money 24 hours a day, and it only makes money and never loses money. Unlike altcoins, the price goes up and down. Which one do you think is better?