Should I Livestream on Youtube or Twitch?

Twitch has substantially more daily viewers than live game streaming on YouTube. Obviously for non-live content though, YouTube easily wins given how much wider the audience is. For new content creators, the vast majority flock over to Twitch too.

Is YouTube better for live streaming?

Considering all tools and settings, YouTube is a more professional platform for live streaming. It has video editing and managing tools, which are important if you want to consistently create video content.

Is it easier to grow on YouTube live or Twitch?

If you're trying to grow your following across Twitch and YouTube alike, Twitch is by far the better choice, because it offers you access to a much larger general audience.