What is the best webinar service?

Question

Software and Internet Services

Hello!
The authorities put before the fact - it is necessary to choose a high-quality and inexpensive platform for holding webinars.
Briefly about the parameters:

• Number of participants from 300 to 800, and maybe more
  
• Video recording
  
• Convenient and solid room interface, so that participants understand the seriousness and solvency of the organizers
  
• Desktop Broadcast
  
• Up to 4-5 presenters at the same time
  
• Ability to embed in your site (preferably a simplified version)
  
• Personal manager (attendance at webinars and elimination of technical problems)
  

With all this, the price should be low and profitable when concluding a contract, for example, for half a year or even a year.
Broke my head, help me out)
Current options:
webinar.fm - quite popular,
ruweber.ru - the cheapest and cool technical support,
myownconference.ru - the oldest, plus they broadcast not only in Russia