'What is the best mobile "text-to-speech" and "speech-to-text" tool for both android and IOS?

Would you please help me to find out the best mobile "text-to-speech" and "speech-to-text" tool for both android and IOS?

I searched the web and found some tools such as:

For Speech to Text(STT):

1.react-native-voice

2.RNSpeakChat

3.Using Google Cloud

4.SpeechRecognizer

5.react-native-watson 

6.react-speech-recognition

7.react-native-speech-recognition

and for text to speech (TTS):

1.react-native-tts

2.react-native-watson

3.react-native-speech

But I couldn't find which one is the best choice. Would you please help me in this regard?

Thanks in advance



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