Advatanges and disadvantages of using theme extensions for storing colors instead of class

What are the advantages of using theme extension for storing custom colors instead of class containing static consts?

class AppColors {    
   static const Color brandColor = Color(0xFF1E88E5);
   static const Color danger = Color(0xFFE53935);
   //...
}

vs

@immutable
class MyColors extends ThemeExtension<MyColors> {
  const MyColors({
    required this.brandColor,
    required this.danger,
  });
  //...
}

//...
final MyColors myColors = Theme.of(context).extension<MyColors>()!;

One advantages for class is that it does not require context. What are the prons of theme extensions?