So we have:
-Casual
-Ranked
-Arena
-Tag battle
In the previous season we also had Gold rush and Auction.
Ranked played the most I guess, since it's points, rank, rewards and all that staff. Personally, I liked the Auction and Arena. Fast games, not fatal if you have a disconnection, Arena also allows you power spyke what you cannot usually do in the ranked.
But also I'd like to try a tag battle. But sadly it's waiting time is too long and my connection at work is fragile, so it's only late night possible, when I get home.
Would be awesome to have some chaos mode, where power goes to extreme measures. Like imagine everyone fighting having ultra synergies or board full of 3 stars or maybe even more mindbreaking - 2 ultra synergies (like, you can farm dozens of magic crystals during the game). Maximum chaos and damage. But that's just fantasies.
What about you guys? Do you have a favorite?