If you look at a lot of youtube reviewers, you quickly find out who knows what they are talking about and whether they offer any worthwhile advice.
Here is what I think -
Ignore anything by Amir of ASR because he is biased, and basically promotes his own views to promote his site and satisfy his minions rather than to provide sensible advice.
The following are worth listening to in my opinion, however there are others:
Streaky
Hans Beekhuyzen
Darko
Steve Huff
Andrew Robinson.
Pursuit of Perfect sound
A number of German reviewers, who really are excellent, but you need to speak German