Interesting question .... the 18k Sedna is a beautiful piece but I'm not sure it captures the essence of the Speedmaster line. I could wear it everyday but some people don't like the all gold/all the time aspect of the FOIS Sedna. On the open market they are similarly priced, so, take your pick. If you don't mind wearing an 18k gold watch with jeans or shorts the Sedna might be the choice for you. On the other hand the Apollo 11 is probably the wave of the future.....Naiid caseback, more accurate movement, much nicer bracelet. Your choice.