Oktoberfest beers are different than Marzen nowadways. Oktoberfests are now more like a Helles (although not traditionally). Which one are you after?
I'm guessing the copper version.. Which if the 2 is the more traditional version? That is what I'm after
Depends who you ask. The original from hundreds of years ago was the copper color. Only in the 20th century did it turn yellow, but is all they serve in Munich today.