I am also 100% in the camp that believes that decks have personalities- I have some real characters on my shelf 
The deck I get along with the most is the Mystic Manga Tarot, because I think it’s personality and way of communicating is closest to mine. The pictures are colorful, fun, and expressive- the deck is able to get across the messages clearly.
I butt heads with the Anima Mundi- that deck is harsh. Which is necessary, sometimes, but can be difficult when you’re asking about sensitive matters.
The Oppositions Tarot is… snobby? Not sure if that’s the best word, but the deck just feels like it knows that it knows more than I do and likes to rub it in my face, while also giving very vague and all-encompassing answers.
The Ostara deck is beautiful but very artsy and abstract. It has four different artists, which read like four different personalities. Makes it pretty to look at but very hard to decipher.
I haven’t read with the Soul Cats deck much yet, but so far it comes across as cute and playful- it prefers to talk about positive or neutral things and will dance away from negative or serious issues.
It’s always fun hearing about everyone’s decks and how they interact with them- really enjoying this discussion! 
Well-said, Garnet!