Overall I'd say Polar since it feels like more of a complete brand/there's more effort going into it. I absolutely adore the Sour team and the videos they put out, but the brand itself is very much like Sk8Mafia. Great crew, but their brand identity/art is basically non-existent. They just shit out decks with the logo on it and call it a day.
My main gripe with Polar though is that I always want nearly everything from their drops, but I can't really justify it because of the price.