I would have to say looking at the loss ratio. I would conclude that Britain lost BoB as they had radar for advanced warning, could choose when and where to fight, could glide back to a friendly airfield, and could be home for tea in minutes.
Total losses of aircraft in the Battle of Britain
Month RAF Luftwaffe
July(from10th) 90 165
August 399 612
September 416 554
October 182 321
Total 1087 1652