There are so many webinar platforms, with new ones popping up each day. It's difficult to know which one to choose. Cost is a factor for most of us, as is reliability. But there may be other features you are looking for: screen sharing, automated email sequences, custom branding, etc. I've done my best to compare what I think are the most important elements for most broadcasters. Below each platform, I've added my personal commentary.
Jennifer: I suggest signing up for the free trials and taking your top choices out for a test run.