Selection of a test framework for mobile cross platform apps

I'm looking for criteria for selecting a test tool. The user interface of the most important use cases of our cross-platform app (developed with Flutter) should be tested. Like the actual software code, the tests should only be written once and then be executable for iOS and Android. So I also need a cross-platform testing tool. So far I have tested a little bit with Appium and the Flutter_driver. Are there other test frameworks ? What should you pay attention to when choosing one? Which additional functions could be helpful ?