USA players easily.
I mean , notable brazilian players are FalleN, fnx, cogu, KIKOOOO, fer and TACO.
On the contrary, USA notable players are method, Volcano, Ksharp, Rambo, Bullseye, steel, fRoD. Storm, Warden, n0thing, Brehze, Ethan, tarik, Hiko, autimatic, swag and RUSH.
Based on history, USA players have dominated more the scene.