Which one should I back? I was thinking... if the PnP is for two to three players... Maybe the game is better that way, am I right?
The PnP is only for 2-3p if you only print it once. The only thing stopping it from being 2-5p is the number of times you print the pages. The differing color backs is simply to make it easier to separate the two decks afterwards if you want to play 2-3p again. Some people have suggested putting a little tick mark on the fronts of one set to distinguish it from the other.