Which is better static function return widget or stateless widget

Question

As it clear from title, which one approach is better, static function in class returns custom widget, or stateless widget class?

example for static function returns custom widget:

class FormComponent {
  static Widget defaultFromField(
      {@required TextEditingController controller,
      @required TextInputType textInputType,
      @required Icon prefixIcon,
      Icon suffixIcon,
      Function suffixIconPressed,
      @required Function validate,
      Function onTap,
      Function onChange,
      bool isObscureText = false,
      @required String labelText,
      o}) {
    return TextFormField(
      controller: controller,
      keyboardType: textInputType,
      obscureText: isObscureText,
      validator: validate,
      onTap: onTap,
      onChanged: onChange,
      decoration: InputDecoration(
          prefixIcon: prefixIcon,
          suffixIcon: (suffixIcon != null)
              ? IconButton(onPressed: suffixIconPressed, icon: suffixIcon)
              : null,
          labelText: labelText,
          labelStyle: const TextStyle(fontSize: AppDimensions.fontSize_18),
          border: const OutlineInputBorder()),
    );
  }
}

example for stateless widget class:

class DefaultFormField extends StatelessWidget {
  final TextEditingController controller;
  final TextInputType textInputType;
  final Icon prefixIcon;
  final Icon suffixIcon;
  final Function suffixIconPressed;
  final Function validate;
  final Function onTap;
  final Function onChange;

  final bool isObscureText = false;
  final String labelText;

  const DefaultFormField({
    Key key,
    this.controller,
    this.textInputType,
    this.prefixIcon,
    this.suffixIcon,
    this.suffixIconPressed,
    this.validate,
    this.onTap,
    this.onChange,
    this.labelText,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return TextFormField(
      controller: controller,
      keyboardType: textInputType,
      obscureText: isObscureText,
      validator: validate,
      onTap: onTap,
      onChanged: onChange,
      decoration: InputDecoration(
          prefixIcon: prefixIcon,
          suffixIcon: (suffixIcon != null)
              ? IconButton(onPressed: suffixIconPressed, icon: suffixIcon)
              : null,
          labelText: labelText,
          labelStyle: const TextStyle(fontSize: AppDimensions.fontSize_18),
          border: const OutlineInputBorder()),
    );
  }
}