Originally Posted by
proscale
If you can spend your way to Delta platinum, collecting Flying blue miles for use makes more sense, flying blue definitely has more "reasonably" priced availability than delta.
Again, OP won't get much in the way benefits from their DL status if using their FB number (if they don't earn at least FB Gold as well). No C+/Preferred seats on DL flights. You can maybe talk your way into AF/KL lounges, but it won't be automatic. So it doesn't really make much sense to maintain DL status if you are going to be chasing FB points.