i have a kilo tt and an SST, and i like the SST's ride and geo much better.

If you're commuting, the SST is the better choice as it already has brakes and has a more comfortable geo. The SST also has nicer wheels (alex r500 w/formula hubs) and bullhorns. If you're getting one of the smaller sizes, you'll be happy to know the SST does not have toe overlap in sizes 52cm and up. This isn't a big deal to most people, but it was a selling point for me.