This is difficult to decide.

Eminem is experienced in battlin. Has humour and charisma but would struggle to find anythin to diss Nas on.

Nas is more creative and has a lot more to diss eminem on but doesnt the sort of sparkle thing that em has if ya get what I mean.

Overall I'd say Nas would get it coz theres more he can diss em on but em would come strong too with humour and the odd dope punchline.
But the fact of the matter is......WHO GIVES A FUCK

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HARRY R.I.P
1940 - 2002

In Respect