It would start out as a draw, but like Species 8472, the Borg can't think creatively, All they want to do is inject nanoprobes etc. While the Daleks assume they are superior to all life (much like 8472) the Borg want to consume what ever tech they can.
It will be a fight at first, but the Borg will simply keep throwing drones at the Daleks and losing them. The Daleks will win by default. IMHO