From what I've heard from most streamers - Twitch is not competitive. The account banning rules are a lot less clear and the monetization isn't up to the level streamers can usually pull in from YT super chats. Additionally I think there's a bit of an issue in the fact that a lot of creators (streamers as well) will end up posting highlight videos or stand-alone video content to supplement their channel (i.e. someone playing fortnite might put together a guide on how to scavenge efficiently for newbies) and that video can end up driving traffic to their regular steams - but it'll only do that if the streams and the video are on the same platform (so a stream highlight on twitch will get twitch stream viewers while a video on youtube will get youtube stream viewers) - with the discoverability of regular videos being much higher on youtube it puts youtube in a stronger position.
