I used to stream on Twitch but, I just don't have the time to maintain a consistent streaming schedule along with weekly updates for my comic (and I work full time).
Personally I prefer Twitch it is more geared towards livestreaming - where as with youtube (in my experience) creators tend to only livestream for special events (like a donathon or something).
I found one of the best way to grow on Twitch is networking with other artists. For instance you could do a trade where you draw line art for one another and then swap and color each other's line art - this way you are giving your viewers something to watch while simultaneously helping each other's channels grow.
When you're active on other people's streams they notice, and they are more likely to give you a shout out if they like your content.