I am a Delta 1-1/2 million miler. Platinum. But used all my miles on an upcoming trip and living in SW find Delta not overly suitable for my travels, so switched to United as my "primary". However, still have occasion to fly Skyteam. I joined Aeroflot's program on a whim but noticed their Skyteam elite plus level is lower than Delta's. So anyone, should I just put my miles on Aeroflot vs Delta?