Bitcoin Gold is a fork of bitcoin just like Bitcoin Cash. One of the notable changes is that they have changed algorithm to Equihash which makes it asic resistance and its a memory intensive algorithm. The idea is to bring back GPU mining plus some other changes.
Well Asic machines will no longer be used to mine and also it will free up the bitcoin network from the larger companies that offer these types of miners.
I think BTG can be a game changer no doubt about it. I think now is up to the miners. Once the miners make that choice we will know where is headed.