I'm happy with my shimano hub. It's the ultegra/xt level one paired up with a homemade light consisting of two 3W leds. Only issue I have had is that its a bit of a pain to service compared to a normal hub because of the magnet and wires. Other than that I'm happy with the money saving over the schmidt but have not actually used one.

I think I'd be more concerned with the difference between 3W and 30W than the two hubs. There will be a pretty big difference in the amount of light produced. Why did you go for the homemade 30W system in the first place? If it was for more light a dynamo will perhaps not be the answer. Nothing worse than spending all that cash only to end up with a light that isn't bright enough.