What spark plug is needed for a Stihl MS260?

There are Bosch or NGK options. WSR6F - Bosch WSR6F Spark Plug https://www.lsengineers.co.uk/catalog/product/view/id/46459 BPMR7A - NGK BPMR7A Spark Plug https://www.lsengineers.co.uk/catalog/product/view/id/5400