I've been streaming Pokémon anime nights weekly for the Twitch Plays Pokémon community for a few years, and we've had our share of streaming platforms. It's actually all based on the movie nights I did for GT years ago. Originally we ran on Livestream, and when that closed down we moved to Rabbit. Now that that has closed down we had a choice between Discord Screen Sharing and Kast. Kast was initially mooted as the replacement for Rabbit but they debuted while it was in Alpha, and unfortunately gained its reputation far too early; it has come a long way in the last year - it's still not perfect but it's certainly viable. Nonetheless Discord has the advantage of being a communication platform that has larger reach and often people don't need to sign up to an additional account, so it has better access, however there are significant drawbacks in terms of quality and chat options (ironically).
Discord
Pros: Easy access (most people do not have to sign up as they have an account already), up to 50 people can watch for free, web support, desktop app available, no ads
Cons: Requires a free account, designed for video conference so quality dips are all over the place, sound sync issues, mono sound, a weird screen-tearing issue if the whole frame moves (they might have fixed this), not easy to bring up both video and chat at the same time (like traditional streaming services), limited to no mobile support
Kast
Pros: High quality, traditional stream layout (i.e video on left chat to right), up to 100 people can watch for free, full mobile support (iOS & Android apps), web support, desktop app available, stereo sound
Cons: Requires a free account, web support is limited to Google Chrome, mobile support is still in its infancy (but does work mostly), shows ads (but only upon joining, like Twitch)
So it depends on what you want. Imo Kast is the standout winner if you are looking for a traditional stream and is much better in terms of quality - Discord does have the advantage of larger adoption rates but it's irritating to use until they enable an option to have a chatroom on the side, and even then the quality isn't great.
Livestream was the only service we used that didn't require an account to watch or chat, all others do, but a lot of people have Discord.