I have only found 3 streamers in the site and they all suck at playing the game. Just look at their win rate ratio.
Seeing their win rate ratio I would rather bet on the professional games or tournament than risk on their win rate.
I think it is much more better since we would know who their opponent is and their opponents strength and know who is going to be dominant and who is the under dog of the match.
I am not good in playing the game and I do think that betting on other professionals is better than trying to play a game which you know you will lose. I have been betting on football betting and I have won some and lose some but it is still better than the one I play myself.