I know the differences (at least i think) between these but not to sure which one would be better for (4) paralleling of 480V, 2500kVA, 4w+g generators.
Droop system is simpler, but voltage drops as load is applied, what is your tolerence for voltage variation?
Before the question can be properly answered you need to tell us a bit more about your system. Standby or prime? What kind of voltage and frequency tolerence do you have? Will need capability to parallel to grid?
Cross current compensation can work well in many applications, best if units all the same size or type with the same voltage regulators.
Why aren't you considering active kVAR control? Just about every major switchgear supplier and controls manufacturer has components or systems to provide very good sharing for units this size.
Basler has some excellent literature on most methods in their technical library, a little time to register and then access to some very good free information.
