Of the bitcoin forks to have occurred this year, bitcoin cash has been the most popular. In terms of uptake, value, and adoption, BCH is the market leader by far. This much can be gleaned simply by looking at the market prices and trading volume of bitcoin cash versus that of its successors, bitcoin gold and bitcoin diamond. Newly crunched data now shows the extent to which bitcoin cash has outmuscled its younger siblings.
Data researcher Antoine Le Calvez has been tracking the movements of BCH and BTG on forks.network since the coin splits came into existence. His figures show that three times as much bitcoin cash has been claimed as bitcoin gold, which was born three and a half months later. A series of charts track the amount of BTG and BCH that were moved following the respective forks. In other words, they indicate the amount of each coin that was claimed by bitcoin holders. That figure stands at 2.2 million for BTG but 6.6 million for BCH.
Forks, when they are high-profile and actually have a decent backing to them from portions of the community, can be free cash, no questions asked. It's insanely easy to make money off of forks like that, but just trying to fork it constantly will be a waste of time. BCH and BTG were probably the last "good" forks that won't be a waste of time for users, and everything from this point will likely be a complete waste of time unless you have a few hundred BTC already.