Yeah, came here to say this. Statistically, Crystal Tower will be your most likely result anyway.
And I know its just my personal experience, but I get a healthy amount of variety on my Alliance Roulettes (it's the only one I do every day, because I loathe 4-man stuff), to the point that I think people that complain have the worst luck in the world or have limited exposure to the roulette or are just exaggerating.
