Champions of the Galaxy has expanded beyond the GWF! There are now smaller feds or editions that add their own flair to the Champions of the Galaxy magic.
The GWF is still the over-the-top universal federation in which factions fight each other.
The POW (formerly CPC) is more focused on straight wrestling, and less on factions fighting than the GWF is. With the creation of the POW had come with the option to run a MMA fed as well as, or in conjunction with a POW wrestling fed!
The aCe has its own take on the Champions of the Galaxy game. The stories are more sci-fi oriented with the early editions containing zombies, and a plague outbreak. In fact in the aCe there is a war going on in which they try to fight in the ring. The aCe also has some special card mechanics that separate it from the GWF.
If big sci-fi stuff isn't quite to your tastes, then there is another option. Champions of the Galaxy also has a Legends of Wrestling (LOW) game in which there are sets and cards of real life wrestlers and legends!
There has also been three sets released that is a 'minor league', called the GWFZ. These sets were created by loyal fans who won spots to create their own card.