Both! Uprising is a standalone game and upgraded version of vanilla Imperium, but it is in fact completely compatible with both the vanilla Imperium and both its expansions, you can just take Uprising and add nearly all the cards and mechanics from both vanilla and both expansions for a huge card stacks and more randomised play (unlike vanilla imperium where there were some key OP cards that routinelly popped up like Lady Jessica or Kwisatz Haderach, you can compare with computer version where it is still unbalancing the game). This of course led to dilution of new Uprising mechanics, but interestingly enough the authors thought about that and put a lot of it not on the cards but on the board so the effect is minimal (in case of playing all together the board from Uprising is used).
Both! Uprising is a standalone game and upgraded version of vanilla Imperium, but it is in fact completely compatible with both the vanilla Imperium and both its expansions, you can just take Uprising and add nearly all the cards and mechanics from both vanilla and both expansions for a huge card stacks and more randomised play (unlike vanilla imperium where there were some key OP cards that routinelly popped up like Lady Jessica or Kwisatz Haderach, you can compare with computer version where it is still unbalancing the game). This of course led to dilution of new Uprising mechanics, but interestingly enough the authors thought about that and put a lot of it not on the cards but on the board so the effect is minimal (in case of playing all together the board from Uprising is used).