To be honest I wouldn't bother. Flying Dutchman was an excellent FF programme but when it became Flying Blue it went downhill right quick and have continued to do so ever since.
Every year they find new ways of reducing miles earned and the value of already earned miles while making it more difficult to spend any of them. Then they try to sell you the changes as an improvement.
The only value you get from Gold or Silver is lounge access where you can treat yourself to being patronized by a very important receptionist if that is your thing. If you travel on business class it adds no value whatsoever.
Flying Poo is a well earned nickname.