What is a type?

type PersonT = {
  name: string;
  age: number;
};

What is an interface?

interface PersonI {
  name: string;
  age: number;
}

Types vs Interfaces

• types are versatile which means that there are more ways to use them => (types++)
• interfaces have one feature that types do not have => (interfaces++)
• types are less complicated => (types++)
  • interfaces are a tiny bit faster than types, in other words, they are faster to compile but the difference is negligible => (interfaces++)
• types have more features => (types++)
  • the ability to merge interfaces but not types => (interfaces++)
• types can be used for everything without the need of interfaces (interfaces can only describe objects) => (types++)
• interfaces have shorter and more focused error messages => (interfaces++)
• types are easier to read and write (cleaner) => (types++)
• the word type has 4 characters meanwhile interface has 9 => (types+=4)
• using any of them is not a big of a deal they both works fine => (types++, interfaces++)

Conclusion

In a nutshell, be consistent and always favor types over interfaces.

Points:

Types : 10 interfaces : 5