I have used typed on pdf for over two years and found it satisfying though not as intuitive. The smart form is not so much different than the typed on pdf by the same developer except that we now have to have a paid subscription to use the app. I am not sure what I am paying for if I am not using the developers server to send emails . Its ok to sell your app for a onetime fee, not become exploitative as there is no added service that requires continuous payment.
Oskarxm about Smart Forms