I'm the maintainer of this library so here are a few reasons:
It is heavily maintained (changelogs for testimony)
Unit tested (not 100% coverage though)
This one is dart only, it does not use external plugins so it works on all platforms and his tree shakeable contrary to other libs
supports internationalization
use best in class google metadata
I'm also the author of https://pub.dev/packages/phone_numbers_parser which is a rewrite of google libphonenumber so I can quickly make changes to the underlying library. Although phone number parsing is hard, that lib has had some time to evolve and is based on a true and tested one.
Can distinguish between fixedLine and mobile phones.
I will be tracking here the list of widgets that I plan to implement wrappers to. Fill free to suggest your favourite one)
https://pub.dev/packages/flutter_markdown
https://pub.dev/packages/getwidget
https://github.com/Origogi/Flutter-Credit-Card-Input-Form
https://pub.dev/packages/advance_image_picker
+
https://pub.dev/packages/textfield_tagshttps://pub.dev/packages/easy_mask
https://pub.dev/packages/mask_text_input_formatter
https://pub.dev/packages/input_slider
https://api.flutter.dev/flutter/cupertino/CupertinoDatePicker-class.html
https://api.flutter.dev/flutter/cupertino/CupertinoPicker-class.html
https://api.flutter.dev/flutter/cupertino/CupertinoSearchTextField-class.html
https://api.flutter.dev/flutter/cupertino/CupertinoTimerPicker-class.html
https://github.com/henryleunghk/flutter-native-text-view
https://pub.dev/packages/intl_phone_field
https://pub.dev/packages/otp_autofill
https://pub.dev/packages/cool_dropdown
https://pub.dev/packages/syncfusion_flutter_datepicker
https://pub.dev/packages/syncfusion_flutter_gauges
https://pub.dev/packages/syncfusion_flutter_sliders