I am casual player and I’m in arena 3 “S.S. Arcadia”
For me they will be Ankylosaurus, Einiasuchus, and Stegosaurus. I love the Ankylo because it is great counter for raptors. The Stego is also good for raptors but usually I use it when I’m in tough spot. And at last but not least Eniasuchus, armored, with the combo Ferocious strike and stunning inpact easily melt other dinos ( welp from my arena ).