IMO , Everyone can just use whatever forum they would prefer. Some people might prefer this one , because it has more information about the game , and simpler , others might like the official one , because of the forum events/badges or even people might find the official one simpler.
Some might even use both , just like me , I will try using both and be active on both , to support each one , and most importantly to support the game. So nice meeting you all , can anyone direct me to the forum rules btw. Since I'm new and confused a little.