depends on the field but i personally think that when trying to get the best exposure possible shady foreground and shady background makes the cleanest images. shooting into the sun give a hard back light on your subject. and the lighting on your subjects face is even and more pleasing to look at because you can actually capture the detail in their faces rather than having pictures of players kinda of squinting with the sun in their eyes with rather flat lighting that requires higher shutter speeds than desired to freeze the action.
im personally happier with the results i get shooting into the sun, i feel my shots are easier to work with and expose. i am ok with the grass getting blown out as a result if i can have better detail in my opinion which is by no means the right opinion
im not as experienced or talented as most people here but the soccer shots i got from shooting into the sun i was overall more proud of the work i did. i just wish my lighting for basketball was better lol







