Opinions needed!- Difference between instant teleseminars and gotowebinar

hey guys! hope y'all are doin well and having a great memorial day weekend

anw i'm currently thinking of conducting a webinar for my list of clients and not sure which program to use- gotowebinar or instant teleseminars. Cuz i've seen the features of gotowebinar and its definitely very easy to use and user-friendly, however the downside is that its very expensive if i wanna host a high number of audiences ($488 monthly for 1000 audiences maximum), and the maximum capacity i can take in is 1000 people at a time.

For instant teleseminars, it allows me to take up to 2000 people at a time, for just $47 monthly, but the features dont seem as user friendly as gotowebinar. Besides, i read that instant teleseminars doesnt allow power point slides, unlike gotowebinar.

So i'm currently unsure of which to use because of the capacity issue and the features issue. Anyone here used instant teleseminars before? could you share what the features of it are, and does it allow webcasts and screen capture like gotowebinar?

I need some advice on which to use, as what i'm currently intending to do is host a webinar for about 1000 people, and it needs to be able to have a screen which allows me to draw and elaborate diagrams for explanations and stuff.

Thanks guys