Meh, Strange is a thousand times more powerful than GR.
GR didn't win because he's powerful, he won because Strange let down his shields and guard and walked over to the dead Ghost Rider. He was basically sobbing about killing GR. Then, GR came back to life and attacked Strange by surprise with a penance stare.
Thor v GR: No BFR?
GR has caught the hammer before and he's nearly indestructible. The penance stare would KO Thor.