Eri,
Both should work fine, so it comes down to what type of sound you like: the Grado is smooth and has a terrific midrange; the Goldring is punchy and detailed. Sometimes there are hum issues with the Grado, and it can "wobble" in the wrong tonearm, but I've rarely found either of these to be a problem, especially with metal platters, and the Thorens low-mass tonearm. For safety and drama, choose the Goldring, for magic, choose the Grado. They are both good, though the Goldring has the better diamond.
Both should work fine, so it comes down to what type of sound you like: the Grado is smooth and has a terrific midrange; the Goldring is punchy and detailed. Sometimes there are hum issues with the Grado, and it can "wobble" in the wrong tonearm, but I've rarely found either of these to be a problem, especially with metal platters, and the Thorens low-mass tonearm. For safety and drama, choose the Goldring, for magic, choose the Grado. They are both good, though the Goldring has the better diamond.