Okay, so I started going to prerelease a during the beginning of Theros, and I went 4-0 both times. I played WU heroic and Boros deck wins. Being very competitive, could people say what prerelease pack is best?
Well, because the card pools will be 50% Journey into Nyx, which pack is best is going to depend in large part on how good each color's commons and uncommons are in the set. But considering just the promos, it seems pretty clear the white one is the best. Black and green don't seem bad either; red and blue are fairly powerful, but 7 mana is a lot. Unless the format changes dramatically with the addition of JOU, though, Dawnbringer Charioteers seems likely to be completely ridiculous.
Also, In the seeded booster, the second rare also seems to be confirmed ahead of time. Any guesses on what they might be?