There is no simple answer to this question as it depends on a number of factors, including what industry the startup is in and what stage of development it is at. However, there are a few general characteristics that tend to make startups more successful.
Firstly, the best startups typically have a strong team of co-founders who complement each other's skillsets and are passionate about the company's mission. This ensures that the company is able to weather any challenges that come its way.
Secondly, the best startups have a laser-like focus on their core product or service, and they constantly strive to improve it. They are also able to pivot quickly if necessary, in order to stay ahead of the competition.
Finally, the best startups are well-funded, which gives them the resources they need to scale quickly and hire the best talent.
If you're looking for more specific advice, you can check out this list of the top tech startups to watch in 2020.