I run a Shimano DH3N80 and a DH3N72 on my commuter bikes, and I have a spare wheel with a Shutter Precision hub dynamo for any other bike that may need lights. All three are excellent, and the Shimanos have been so for years.

Main differences are: the SP is lighter. And I used to think the SP would not cause vibrations at higher speeds, unlike the Shimanos. However, turns out it does vibrate if you happen to connect a rear light too -- yet, to confuse matters, not with every rear light, just with the ones that draw a lot of juice.