(They both support screen sharing)
Seems like these are apps specifically designed for corporate use and I assume they're easy enough to use for the average user to approach. I imagine that this is tied to dedicated IT services and other corporate support that makes them attractive. I'd have to test them to see if they're better. Skype was particularly heavy. I've seen easier, faster and more effective screen-sharing software. I haven't tried Discord's but I read somewhere that it does have this functionality.