I've had the Shimano DH-3N71 dynamo hub on my winter commuter for a few years now, last summer I splurged and got the Schmidt on my tourer. I built both wheels myself, cheap rim for the Shimano hub and a nice Velocity Cliffhanger rim for the Schmidt, double butted spokes for both wheels. I have the Busch & Mueller Lumotec headlight with standlight on both bikes.

The Shimano is entirely adequate for commuting and around town use and is good value for the money, but the Schmidt has much sturdier wiring, the connectors going into the hub are much higher quality, and the toggle switch on the Schmidt-compatible Busch & Mueller light seems sturdier than the stock Shimano quality light. The Schmidt E6 lights are also very high quality, but they don't have a standlight. If you can afford the cash outlay, I think the Schmidt with a high quality wheel build is the better long-term investment, but if you're not comfortable laying out the cash right now the high end Shimano will still give you good service.