In GTW, you can setup a follow up email to both attendees and non-attendees. But in GTT, you can only send to attendees. In GTW, you can resend the follow up email but in GTT, it can only be sent once. We pay more for GTT so we should be able to do what you can in GTW plus more. I know GoTo is always working to make their programs better for us to help meet our needs...they are great at that. So, I'm hoping this is something they are working on or plan to.
Our long term goal (probably 2021) is to offer cross-product functionality for the purposes of customizing the feature sets you'd like to utilize. At that point you will see more similar options available in GoToTraining + GoToWebinar.