I've learned a lot of guitar stuff from YouTube videos. But this really irks me: some YouTubers insist that their technique is the only way you should play guitar, and that any other way is a "mistake". There are these incredible guitarists that outright contradict one another in their videos/articles.
Such is the case with pick angle - every video or article I've seen on this issue says that either perpendicular or downward angled picking is absolutely the way to go, without addressing the other one. Which gives me the feeling that they both have their benefits in certain playing situations.
Which brings me to question -
TL;DR: What are the advantages and disadvantages of each of these picking techniques (perpendicular and angled), and when should they be used?