The Best place in my opinion, who want to train for real!
I live half the year in Sao Paulo - Brazil (where I was born), and other of the year in the U.S..
In Brazil we have only 3 Gold's Gym, and I confess that all the Gold's I was in the USA are much better than the Gold's in Brazil.
My favorite is the Gold's Gym in Venice Beach.
Of course it is only my personal opinion, and this choice depends on each one, I believe that USA has the best of the world's Gym with an incredible variety, it's more or less like the food in Sao Paulo - Brazil (which you can eat any kind of food of different origins, such as japanese, italian, famous Barbecue, Indian, Cuban, Mexican, Jamaican, Chinese, Portuguese food and etc, any time of day or night).
However, this does not mean that Japanese food is better than the Spanish or Mexican food, simply, are different.
At some time you may want to eat Italian food, and other time want to eat American fast food, and there is nothing wrong with that ...
So, look and visit some colleges and look for what suits you.