All Terrain tyres on a RRS

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I have finally taken the plunge and replaced my trusty old D2 for a 2011 RRS. Fortunately the car is on 19 inch wheels, despite being advertised as 20.
I like to do a little green laneing from time to time, so will be getting rid of the Pirelli's that are on the car and replacing them with some all terrain tyres very soon.

I used General Grabber AT2's on the Disco and was very impressed with them. However I'm wondering if the new style AT from General would be a better choice for the Sport.
Any views or alternative suggestions welcome.