Mine is without a doubt Loopop.

I get none of them are truly non-partisan since their livelihood depends on synth sales, but I feel like he truly leaves commercialism at the door in all his videos.

He has a very matter-of-fact quality to his videos. He tells you what a piece of gear can do, and shows you how to do it. He's always very subtly enthusiastic about interesting features, but never tries to sell you hype. It's like a manual in video form. Which is very much appreciated. I can form my own opinions thank you very much.