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The best system is to stream on Twitch but still make content on YouTube and uploading your VODs to a separate YouTube channel. This way you can get the most out of a streaming platform, while also getting discoverability via the YouTube algorithm, without gimping your spot in the YouTube algorithm because the VOD upload spam will be contained on a separate channel. If you aren't willing to manage two YouTube channels and stream on Twitch for maximum growth potential then you don't deserve to make it.
Stream = Content Production
Short-form = Content Discoverability
VOD = Content Preservation
You need all three to make it.