This is a difficult question to answer, as there are many factors that contribute to a company's success. However, some people argue that companies that have gone through Y Combinator are more likely to be successful than those that have not.
One reason for this may be that the Y Combinator program provides startups with valuable resources and connections. For example, startups that are part of Y Combinator have access to experienced mentors, a large network of other founders, and funding.
Another reason why Y Combinator companies may be more successful is that the selection process is very competitive. Only a small percentage of startups that apply to the program are accepted, which means that the companies that are accepted are likely to be stronger than the average startup.
Of course, there are also many successful startups that have not gone through the Y Combinator program. Ultimately, it is up to the individual company to make use of the resources and opportunities available to them and to achieve success.