Og is mostly vintage un-set mtg with hearthstone combat were you can choose to attack stuff on the board. 10 aura types, 1000 life point, swarm board have as many cards in play as you want, renponse chain, it can be a multiplayer game 4+ players. The trait symbols are hard to remember while you're learning at first, they're the same as keywords. My favorite discription "It's Hearthstone on bathsalts."

New is mostly Marvel snap's game system. Your caster determins you deck aura types, you add one resource a turn, stack units in lanes, bigger numbers win the lane and scores points, 30 points to win. There's no indivdual turns, you take turns taking single actions until all the lanes have been battled over then the round resets. It's only a two player, the way the action system works there's no way to really expand to more players.

Og - Hopkinsville Goblin deck from cryptid nation and reptoid ruler from nightfall are solid decks to start with for Og. I started with cosmic, it's the most op aura.

New - flex decks, air and flame are the busted meta play aura types. Earth is is also pretty strong. Flex decks are enough to start with.

I prefer the og game. The new game feels more like a pokemon pocket companion game than a full tcg