Which is the better approach, Using List> or List

I was implementing a generic kind of function which accepts a List<someClass> and perform an operation on it, say creating an excel sheet for List<someClass>. So such a method can be used by List<anyClass> because we just need to iterate over the list elements and use Workbook.setCellValue(T value) method. I have two approach for this problem which are as follows:

Using List<List> where Objects are nothing but fields of someClass.

public void genericMethodForExcel(List<List<Object>> list) {
    for(List objects: list) {
     for(Object obj: objects){
        //now obj here is field of someClass object.
    }
  }
}

//how we convert List<someClass> to List<List<Object>>
List<List<Object>> object = someClassList.stream().map(obj->{
     List<Object> list = new ArrayList<>();
     list.add(obj.getName());
     list.add(obj.getNumber());
     return list;
  }).collect(Collectors.toList());

//now calling the method 
genericMethodForExcel(object);

Second approach for this problem is using Java Reflections:

//we pass List<?> to genericMethod
genericMethodForExcel(List<?> list);

public void genericMethodForExcel(List<?> list){
    for(Object obj: list){
      Field[] fields = obj.getClass().getDeclaredFields();
      for(Field field: fields) {
        //now accessing field value using field.get(obj);
     }
   }
}

Which one of these approach is better and why??