Is everyone treated equally under the law?
This is really a matter of opinion since there is no objective way to determine if people are being treated equally. I would argue that, in the United States, people with more money have better chances in our legal system. This is because we have an adversarial system where lawyers defend our interests.
If we have enough money, we can pay for good lawyers. Good lawyers are more likely to get good results than bad lawyers or lawyers who have huge caseloads and can't really pay enough attention to our cases. The poor get public defenders who are always overloaded and may not be the best lawyers anyway. Therefore, they are more likely to have bad results in court.
All people are de jure equal before the law. But there are inequalities in our system that make poor people less likely to win in court than richer people are.