The topic of materials comes up quite often, but frankly scientific studies have shown that the material a flute is made from has no impact upon its sound. The statement that gold sounds better is a frequently heard urban legend. The characteristic sound of any given flute is determined by geometry, not material. The sound is affected by the embouchure cut, the headjoint taper, and the bore of the flute. That said, some people find that the material may make a difference to the player's perception of sound, so indirectly, the player may make subtle embouchure adjustments which in turn change the sound. If you like gold, it may subconsciously make you feel good and therefore play better.
That said, I play a 14K gold head on my silver flute. After my statements above, that may seem hypocritical, but I chose my headjoint not because of the material it was made from but rather for the embouchure cut on this particular headjoint. This one gave me the flexibilty, projection and sound that I wanted.
My suggestion to you is to try as many different headjoints as you possibly can and have someone else put it on your flute while you are blindfolded so that you are not influenced by the material or appearance. Rate each one as you put each thru the same paces playing the exact same music on each headjoint. After doing that, buy the one that sounds and feels best to you while you are playing it. Also have an objective listener or two listen and rate the sound. Afterward, I compared the scores. That is how I ended up picking my headjoint and I've had zero regrets. The material never entered into consideration when I chose it.
However, there is one benefit to a gold headjoint or flute - it won't tarnish like silver.