If you get potensic get it with the controller. I have to say it is irritating setting it up but it is pretty easy to use once you get going. Talking of mobile phone as screen for controller a friend got rid of their DJI mini 3 because of similar issues in the end they couldn’t be bothered pairing them all the time so got rid of it.
I have a potensic atom 2…I like it too fly, pairing with phone is frustrating especially the cable and the camera quality is pretty good. Only bought it a few weeks ago and haven’t really been able to use it until recently so cannot give you much more info on it.