I am late to the party, but I listen to mostly rock and I have the SongTower Ribbons. I've heard both, and the ribbons are superior. I am a bit of an anal guy when it comes to this hobby, so if you're like me or have very good hearing/familiarity with music or playing instruments, get the ribbons. The domes are spectacular, but the ribbons are even better. You'll get that last 10% transparency and things will just sound more "right." However, the ribbons are a trade-off as you'll lose some dispersion, and I don't know how the ribbons measure off-axis, but I assume they aren't as good as the domes.
Just my $0.02. Whichever you go with, enjoy!