As far as high school sports go where the turf fields, generally speaking, are not the same quality and cost of an NFL field, there are more injuries on turf than on grass. I can quote numerous studies if necessary. It’s not just the field, but the correct type of turf shoes vs regular cleats that most high schools use. The caliber of helmets and knee braces and other PPE make a difference too. That’s not necessarily why I prefer grass, but it is a fact.