If the US were to become a single party state, which is of course almost impossible (I couldn’t see a way in which this happened), not in that one party would win elections so often that it became a single party state de facto, but a literal single party state like the Communist Party in China or the Soviet Union where political parties other than the Communist one were illegal, and people organizing in another political organization would be imprisoned or in some other way subject to prosecution under criminal law, which of the two major political parties, Democratic or Republican, would you think would make the US less worse off, and thus would prefer to have control of the government at every level, federal, state, and local?
Assume that either side in the scenario would get everything that the extremists within the party want they wanted domestically, and that a situation like genocide or a third world war won’t happen (please, no Hitler, Stalin, Mao, Pol Pot, Castro, Kim Jong Il comparisons unless you really, really believe things would get that bad…)
I would prefer Republican, because things in the past that the Republicans wanted really, really badly are: abolition of slavery and preservation of the nation, which were somewhat extreme, and ended up being not that bad at all.