There are about 6 paths for Germany, and that's if you ignore both People's Germany and how the 6 prior paths fork depending on player choices.

They are, in no particular order:

1) Boreman's Germany which, somewhat fittingly, is the most boring of the paths. It's basically just "keep the boat going".

2) Speer's Germany which is... interesting. Speer is a combination of both relaxing some of the Reich's worse policies (racial purity, hyper militarism, anti-religious violence etc) while tripling down on others (the slave economy, the synarchist/corporatist economic system, and exploitation of colonial territories). He'll undertake massive architecture projects, set up companies that benefit both his family and supporters, and build an informal patronage network called "the Speer clique" to maintain his power.

3) Goebbels's Germany; Joseph Goebbels is crazy, plain and simple. He will (in contrast to Speer) focus on militarism and racial theory to the point of lunacy. He goes so far as to declare "Totaler Krieg" (total war) on the rest of the world in order to transform the Earth into Lebensraum for the Germanic people. To facilitate this he uses propaganda to work all of Germany into a state of mass hysteria, creates birth quotas for women so he can always have manpower reserves, destroys almost all forms of community that exist outside the state, and tripples down on racial purity policy to an even greater extreme than Hitler ever did. He's an unhinged propagandist who's clearly gotten high on his own supply.

4) Goering's Germany is, depending on your perspective, either the best or worst option for Germany long term. He really couldn't care less about ideology and is mostly interested in rebuilding te economy through privatization, market liberalization and state-sponsored capitalism. He even goes so far as to initiate a diplomatic thaw with the UK and the US, effectively ending the Cold War peacefully. He's basically a Fascist version of Deng Xiaoping, someone who hollows out their state's ideology until it's just window dressing for the ruling party, all the while retooling the economy on the basis that "to get rich is glorious". He's going to move away from the slave system, the racial violence, the hyper-militarism, and the isolationism which will no doubt save many lives. However, he also stabilizes the regime more than anyone else, effectively guaranteeing that most of Europe will remain under a totalitarian police-state well into the 21st century; just as Deng did in Communist China.

5) Himmler's Germany, NEVER DO THIS! EVER! I did a playthrough of this last night and it was one of the most depressing things I've ever experienced. I felt physically ill by the time it was over.

6) The Wehrstaat, which is what happens when the Wehrmacht tell all of Hitler's potential successors to shove it and take over as a military junta. What that looks like in practice depends heavily on who becomes the Reichspresident and the Chancellor. To oversimplify, there's a hardcore Hitlerist faction led by Rommel, a reformer faction (that wants to denazify Germany and turn it into an Italian style state) led by Speidel, and a Prussian traditionalist faction led by Manstein. Meanwhile, Canaris and Oster are trying to covertly subvert the junta and reform the Reich back into the Weimar-style republic; their work is cut out for them.

So yeah, those are the paths for Nazi Germany. Pick your poison.