Ghost Vegan is the best. Unfortunately he retired or went into hiding. His videos "Lament for Vegan Land" and one that I think is called something like dear meat eater are award winning genius. He's the Werner Herzog of vegan YouTube.
I also like Footsoldier, and Bite Size Vegan.
Mic the Vegan is probably the most credible on science, in terms of the environment, agriculture and GMOs.
I like Bite Size, too. My only issue with Mic is that he seems to like misleading titles. Clickbait. but maybe it works.