The pottermore video was very cute! It really wasn't a gaming video though, which imo confirms that the gaming channel has shifted from "games & bants" to "mostly bants and sometimes games (if you're lucky)".
Anyway. To me Dan is and always will be a Slytherin with maybe traits of a Gryffindor. Phil is a Hufflepuff with traits of a Slytherin.
I have always been a Ravenclaw at heart, the only house that I think represents me, but I also got a high percentage of Slytherin the last time I took the test. I think it makes sense, in that I do share some Slytherin traits. It's probably hard to find someone who fits one house 100%.
I think Dan got some pretty silly questions that don't delve deep into the personality of who's taking the test, and that might be why he got Gryffindor. Also the pottermore quiz might not represent the actual traits of the houses accurately; Slytherin especially suffers from having the "worst answers" that people hardly will pick. If you're interested, I think
this is a good read about the interpretation of the quiz, with hints at the points where it fails and how it could be improved.
As for my favorite moments, honestly I second pretty much everything that has already been said (dan's isle of man pic with the smiley caption is a weakness for me, it never fails to make me stupidly emotional), but I want to take this chance to mention the most iconic tweet in deppy history and also a big turning point in my "beliefs" regarding their relationship: the uma thurman tweet, which is now 8 years old (as of yesterday, I believe)
