Current meta <- ranking based on fish/wood/iron collection, battle stats, and training time.
How to Git Gud at Brawl Part 1
How to Git Gud at Brawl Part 2
How to Git Gud at Gauntlets (in the works)
This is just my personal opinion of what dragons are better suited for Brawl. Tier 1 are the better dragons of the game, with Tier 4 being the lesser dragons of the game.