This developed some discussion on a recent trip to Dalaman.
We decided that the question was nuts as either course of action will result in disaster.
But having said that we reckon that its better to stop at V1+10kts than go at V1-10kts. The reason being that in either case your going off the end of the runway, but if your stopping at V1+10 then at least your slowing down. If your going at V1-10 then your going off the end of the runway with full power and no breaking effect.