It depends on your needs and the interaction you want your user to have with your application. In some cases, we recommend to start with a responsive web application to test your project with users before creating a mobile application (as Facebook did). This reduces development costs and will already allow you to analyze user behavior and their appeal to your service. It also allows you to make improvements at a lower cost based on feedback from your first users.
In other cases, however, such as Uber, it is obvious that you need a mobile application.
As it depends on your basic needs, we advise you to contact us. We will be happy to provide you with our expertise free of charge.