listview_comparison.dart

class ListViewComparison extends StatelessWidget {
  const ListViewComparison({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final items = List.generate(10000, (index) => _MyItem(index: index));

    return true
        ? ListView(
            children: items,
          )
        : ListView.builder(
            itemCount: 10000,
            itemBuilder: (context, index) {
              return _MyItem(index: index);
            });
  }
}

class _MyItem extends StatelessWidget {
  const _MyItem({Key? key, required this.index}) : super(key: key);

  final int index;

  @override
  Widget build(BuildContext context) {
    print('Building ... $index');
    return Container(
      height: 100,
      child: FittedBox(
        child: Text(index.toString()),
      ),
    );
  }
}