Oh, look. People equating the favoring of the Confederacy as the supporting of slavery. That's one of my favorite jokes, please tell it some more.
As for me, I don't know what side i'd join. I live in Knoxville, which is in Tennessee, a state that was part of the Confederacy. However, Knoxville was noted for its pro-Union sentiment throughout the war, and I read that there were parades in the street when it was taken by the Federals. On terms of morals, neither side had the high ground.
On one hand, i'd probably want to join the South due to the fact that the war was perceived as an aggressive act of a power-hungry government, and i'm a sucker for any act of rebellion that I feel is started for a good cause. Also, they have, without a doubt, the best battle songs and uniforms.
On the other hand, i'd likely feel a bit of resentment towards the Confederacy for dissolving the nation I was born into instead of trying harder to work things out diplomatically.
All things considered, i'd probably just join up with whatever side my family/friends joined up with. Or whichever side happened to be shouting their propaganda the loudest the day I was headed down to the recruiting station.