Wispr Flow is excellent when you just want to type with your voice inside any app. It sits system-wide and drops cleaned-up text into whatever app you're in.
AudioPen does that too. It transcribes what you say, and when you want more, it rewrites it into a style and language of your choice. You speak freely and get back a finished piece of text you can save, revisit, reshape into different styles, and reuse, either inside any app or within the dedicated AudioPen app.
If you just want rock solid speech to text, Wispr Flow is a great choice. If you want a transcriber that can also sharpen your words when you need it to, AudioPen is the better fit.