RB300 Rewire or Graham Robin for my Gyrodec ?

Hi,
I am thinking of upgrading Rega RB300 tonearm on my Michell Gyrodec SE within limited budget.
A friend of mine has recommended me to rewire it using Incognito Kit or Discovery and the others have advised that the Graham Robin tonearm is a real upgrade and much better than the Incognito/Discovery Rewire.

Would you please share your experiences with me on which one is recommendable for my Gyrodec SE turntable ?.
I appreciate your opinions in advance.

Thanks.
Young