Alliance are a serie of different mods. On the Star Wars GC, you can play the civil war Empire vs Rebel era + Black Sun and soon the Republic and CIS.
I have been adding the republic and cis at new galactic conquest. But I would like explain you the differences with them.
-When you zoom a planet with Republic, CIS, you will not see the exact starbase (if there is one) from the side, you will see a special description showing you how there is one around the planet but you will not know what type. The same will happen with the Freeside.
-Republic and CIS have not filters. By this reason the amount of ground type of companies will be reduced. There will be many companies with more of one type of unit. By example, clone troopers+eweb clone troopers+scouts. I feel that probably many of you will like it.
-Republic, CIS and Freeside share the same command controls.
All the other features will be equal, with exception from a big amount of small things. The best from all this will be how it will let me to use more time in the mod without jump between mods losing a lot of time. Other feature will be how now more new sides can be added, who knows what will be the next. If you are thinking it, it will not be the old republic.