It will be the same when using Stripe. You should be able to use either notification event and get an email after the form is submitted (payment is collected at the same time when using Stripe.)
If you have any specific issues, please let us know.
That is correct. The form cannot be submitted without receiving the payment, when using Stripe or any payment add-on that collects the card details in the form. Because that payment must be processed before the form can actually be submitted and create an entry, either event should work fine. Try it out, in test mode first.