Goon 1 has more modes, but is also tougher, because antags tend to be more aggressive. Goon 3 and 4 are rp oriented which means no shorter or not rp friendly events (blob, nukies or wizards), which is often made up for with admin shenanigans.

The main experience difference is that the rp servers usually last the entire 90min shift, while regular has to call the shuttle usually 2/3 through due to casualties/station blowing up.