Id say non of all the youtubechannels at all. Their all in it for the money and views. But then some is better then others like kevin stingray biology and rodrigo at predatory fins. The of course our own
thebiggerthebetter. His channel is always fun to watch.
If you are looking for aquarium related, I think Aquarium co-op gives overall good aquarium knowledge, not really to do with any monster fish but very informative about the smaller species.