Well I'll put in GMG as my favorite now.
As Friday put it; Sigma-13 isn't boring, no shortage of enemies coming in there and we get the joy of being pitted against both Corsair caps and Outcast caps.
GMG enjoys a strong alliance with Kishiro and the Zoners, it's handy being allies with Zoners the only others being the Order faction, so at times you can expect to see a GMG vessel near one of the Freeports.
GMG has a major grudge against Kruger as well as the RM and RFP due to war that was initiated when Kruger convinced Rheinland to invade the Sigmas. After 80 years if fighting, Rheinlands fleet was wiped out. This resulted in a big mess of debris in Sigma-13 system and despite GMG's grudge against Rheinland an agreement was made to allow ALG to come in and clean up Rheinlands mess.
GMG is also enmeshed with the internal politics going on in Kusari. GMG has secret ties with the Blood Dragons, Blood Dragons receive funding and training from GMG in exchange they target Samura ships to hinder their gas mining efforts. This while maintaining a neutral status with Samura itself (former allies but switched to Kishiro).
GMG had a former alliance with Corsairs and Hogosha as the middlemen in the artifact trade but GMG got cut out by the 2 factions and now holds a large grudge against both the Corsairs and Hogosha. This works out fine because Samura, while neutral to Kishiro, uses the Hogosha to impede Kishiro industrial progress because they are major competitors.
Then there's the Outcasts GMG has come to hate when the JH to Omicron Beta was discovered and Outcasts came pouring out. This is interesting because their is an alliance between Blood Dragons and Outcasts, but Blood Dragons maintain their relations to GMG.
All so very complicated.......and yet all so very fun. ;)