devtrackers.gg
The trackers like the one I use show how the cat deck did better over 1000+ games. https://mtgarena.pro/decks/locdeckspreconworkshop-cats-1339708
Edit: Gawker_sucks has a good break down on how to actually read this info below. And its the Dogs deck that is actually a bit better.
Dogs are actually running (very slightly) ahead across all players.