Bitcoin Gold is the only Bitcoin fork that implements the new ASIC immunity proof algorithm. Along with this new hashing algorithm, Bitcoin Gold implements new difficulty adjustments for each block and gradually increases the difficulty based on past block times.
Finally, Bitcoin Gold is one of the few Bitcoin forks that support Segated Witness (SegWit) technology and playback protection. SegWit increases the number of possible transactions per block, and replay protection prevents fraudulent parallel transactions on two forks.