Twitch. I figure their corporate masters are about equally evil, so if you really have to choose one you may as well go with the one that still has better discoverability, community, and chat. #AlternatePlayer makes it tolerable.
YouTube, but there are a few creators that only stream on Twitch that I like. The content is more important than the platform to me.
Also, weirdly, I find Twitch generally has the less toxic chat - Twitch as a company tends to be better at policing their platform while YouTube really doesn't give a shit... Moderators are definitely more impactful, but Google really doesn't give a shit about moderating.
Twitch is better for audience integration like what happens in dougdoug's stream, and unless it's some major event or well produced ttrpg I can't be arsed to watch unedited content.
Youtube has better quality and rewind but twitch has more interesting chat, even if it is just spamming emojis. Twitch chat has a vibe, feels like you are in a stadium. Also for gaming streams, twitch is a must. Also you need a browser extension like 7tv to appreciate the chat.
The couple of streamers I watch regularly, all post thier streams to YouTube the next day, so I watch there. I do still have a twitch account, so I can use the free sub I get with Amazon prime to sub to one of them. Not much, but better than nothing, as they don't have a patreon account. A secondary reason for maintaining that twitch account is to reserve my particular username, just in case.
In terms of twitch chat and/or interactivity, I just could not possibly care less. I use FreeTube for all of my YouTube watching, these days, and I keep comments completely turned off. On the rare occasion I do actually watch something live on twitch, I have chat completely hidden.
I've never watched live streams before TheRunningManZ started multistreaming on YouTube aswell. I don't really care about other streamers (except maybe SourSweet) nor am I interested in games other than DayZ either.
Twitch, for the community. I used to watch youtube streams and i'm still not even sure if they have raiding. Also drops, game integration, channel points.
Kick—syphoning up as much thotwater as possible from thirst traps
In all honesty, I never messed with yt streaming and was quite chronically on twitch for almost ten years. Mostly hanging out in Aris' streams listening to him talk trash and dicking around. But, his channel got so big and too overrun by overzealous mods that he doesn't ban anyone unless you @ him with something stupid. The subject of Paul Walker came up and I was memeing like everyone else and put "Pedo Paul" as the most throwaway comment ever, and guess what? I was afk and came back to a permaban. I know it wasn't Aris (the streamer) because I know he wouldn't have given two shits about that. So, I was like, all the other streams I ever really watch are dark souls and re1 speedruns, might as well use this as an opportunity to be more productive with my time instead of hanging out in vacuous chat rooms absorbing the exact same content continuously.
I hungout in his stream for the vga's to see the memefest I knew it would be, but I sort of look at it as a fun time while it lasted, and a gratuitous ban from my favorite streamer is what I needed to break away from the unproductive, rote addiction I had. Podcasts are a better alternative to background noise or multitasking anyway. At least for me.
YouTube, because Id rather learn things than watch someone pretend to be excited about something or read the desperate messages of 1000 lonely men because the streamer is female.
(To be fair, twitch has some decent content. And google is probably worse than amazon.)