One of the subtle differences in Supremacy 2020 is the resource deck. Minor differences but they have a huge impact on play.
First, the starting cards are dealt out randomly. Odds are, your cards will not be in your home country. That makes you vulnerable from the beginning. Vulnerability = tension. Tension = fun. 🙂 This forces you to build and deploy troops around the world immediately. There is no time to sit back and relax. When everybody does that at the same time, there is bound to be trouble.
Another interesting effect is the deck composition. In general the superpowers are industrialized, simulated by the supply centers. Most of the resources tend to be scattered around the globe in the neutral minor countries. Your industrial power is worthless without the input of resources to fuel it. Your economy in Supremacy 2020 will be much more international. You can’t just sit at home and keep what you have. Your economic base will start off scattered abroad. Again, this forces players to quickly build and project military power around the globe. The isolationists will quickly find most of his economy seized and shut down.
Again, everyone racing to expand and project military force around the globe at once, is bound to produce lots of conflict. In Supremacy 2020, conflict starts immediately on turn 1. Players build up. Multiple wars usually break out on turn 2. There is no time to mess around.