The verdict
If your funnel loses people at a form, such as a demo request or an application, I'd pick Typeform. It is quick to test and cheap to try on the free plan.
If your funnel loses people because they never see the demo, pick eWebinar. A session that runs when each person is free solves attendance in a way a better form cannot.
For most small teams I'd start with the form, because it is the smaller change. Add eWebinar when you have one session you repeat often. They also pair naturally, with Typeform on the registration step and the webinar as the next stage.