What's the best app that transcribes voice to text?

Give Evernote a try. Haven't tried speech-to-text on mobile, but works good enough on Desktop (Windows).

Cassette can transcribe from voice to text and can do it pretty well

Sonix might work for you. It's completely automated and can return a transcript in less time than the length of the recording (eg. 30 minute file will take less than 30 minutes). Because it's completely automated, it is not 100% perfect but can get pretty close with a clear, crisp audio file. Price = $8 per hour of transcription (13.3 cents per min) Upload a file to Sonix and you will receive an email notifying you that your transcription is finished. The email will include a link to the transcription. The transcript includes timestamps, highlighting, and editing functionality built right into the transcript. You can then share it or export to many formats as you wish.