What is the best app development software for a new project

Hi everyone I am planning a new project and trying to figure out the best app development software to rely on. There are so many platforms some focus on speed, others on flexibility and it gets confusing quickly. I had really like to hear from people who have actually built apps. What software has helped you create stable and scalable apps? Any honest suggestions about tools that work well for both small and mid-sized projects would help a lot. Please share pros, cons, and real experiences so I can choose wisely.