Weel my personal opionion depends on if your gonna be working closely with the artist. If the artist just wants the beat, and he's just up and coming and is doing some sort of underground freestyle thing, most likely he or she isnt gonna care much about re-arranging the beat because for the most part, its not gonna be on a commercial album and when your doin the freestyle thing, it's more about the lyrics then the beat.....If on the other hand the artist is paying for studio time or puttin a serious project together, the artist is prolly ognna know what he or she wants. How they want it arranged, how they want it to sounds etc. In that case give them as much of the raw beat as possible. All the different wav's, reason files, etc etc. It totally depends on the artist