For a hub comparison alone, DT. Maybe the 240 instead though.
Some people complain about freehub failures on shimano hubs. I've used a lot of shimano hubs (Tiagra, LX, Ultegra, XT) and have never experienced this. However, shimano requires a bit more maintenance as it is non sealed bearing, and the cup and cone system is pretty sensitive to adjustment.
That said I just bought an XT 29er wheelset because the package as a whole was really appealing (and at a good price).