Trading systems are very different, such as stock T+ 1 and futures T+0;
Stocks can only make more money, and futures can be traded in both directions;
Firm stock trading means how many shares you have, and futures can be enlarged by margin trading.
Finally, it shows that any market with opaque information and limited market size that can be manipulated by large funds is not a fair market. Therefore, futures are better than the stock market, because there are fewer varieties and it is easier to manage, but it is also unfair.
Foreign markets are just for fairness! For example, the Enron incident in the United States and so on.