Yeah, and Vimeo Premium isn’t really a webinar platform. Just live streaming. So, it really comes down to whether you need live streaming… or if you need all the usual functions of a webinar platform (RSVP, followup emails, etc.).
If you need a full webinar platform, a lot of people use EasyWebinar, WebinarJam, etc.
You might want to check out Shane (from Thrive Themes) videos on his personal site: ActiveGrowth.com He’s done quite a few video reviews of various webinar platforms.