I have both as well, and can't deal with the fiddly cheap plastic connector used in the Shimano. Those large metal spade connectors are such a simple bit of good design, I'd pay the price difference for just that aspect. Now I can't mix and match the lights from one bike to another without a lot of work, redoing the harness.
I've not bothered to observe any difference is charging speed, as it isn't too much of a concern for me, but every single test comparing dyno hubs has the Son out on top, in low speed charging. Of course I no longer read any of that neither.
This thread has made me think how much bicycle touring is so much easier for all the gear we have. It should make touring much better - If ever one can get out of the house, cycling, rather than comparing which widget is best, saving up, buying, saving up - upgrading.
Could all these improvements have people like me losing track of how simple it could be, and once was?