I've seen at least first 3 videos, or in he case of XG3E, bore witness to his "mommy" videos absolutely rampaging my recommended for a time. Good old youtube.
And all I have to say is... well, I just don't agree at all with any of what they say. One is just a fad of repeating the same clip with swapped fanart of one particular character (some, admittedly nice) while the other two either write something purely for meme value, characterize your personality as being the same as your favorite Touhou character or make up a personality that quite frankly does not relate to anything I've seen in reality (at least by any form of specific behavior, it's all broad strokes when it lands). Speaking of suwawako: Maybe he's a had a lot more contact with the fanbase to draw these stereotypes, but in my eyes, the feel like some attempt to imagine what the fan of each character would look like, to pad out for content. Personality Tests are an evergreen mine of clicks,so from a channel maker standpoint, these are a great idea, even if you have to complement anecdotal experience with pure conjecture, or worse, instinct.
As for my top 10: Aside from the podium always being Patchouli, Suika and Yuyuko, the rest of the list is pretty volatile and seems to change every time I do that test. It's interesting because it doesn't ask you a traditional placing of characters in a list, but rather, decides your preference for you in a duel format. Perhaps that's a better way of rating what your true preferences are? I find it to be messy, especially, after reflecting for a bit, I realize often don't give the right answer to a duel question simply because I want to move on quickly from a poll with so many questions.