I have never been able to talk myself into a Schmidt. There probably is no meaningful difference. My Shimano dynohub has been through quite a bit and never had any problems. People tend to like the Shimano connector a little more, the Schmidts have some fiddly little crimp connectors that would be a pain if you have to fix a flat

That being said, I probably will get one of the Schmidt XL hubs for my next bike, the dropout contact is a really good idea