The Son Edelux is very good, have been using one for the last 2 years, prefer this to the cheaper option of the B&M LUMOTEC IQ Cyo, these are about half the price or less than a Edelux, I had one of these, and after about 6 months use, it snapped at the bracket mount, the Edelux can't do this as the body is alu, not plastic.
For the beam produced, there wasn't a noticeable change when I went from the IQ to the Edelux. Also have a Supernova E3 fitted to another bike, and prefer the Edelux to this.
If you are looking at a German brand, would look at ordering from one of the German suppliers, as they are normally a lot cheaper than any UK suppliers.
For the connector, if you look at it, you have 2 bare wires from the light, and these are sandwiched into the grey/black connector cap & cover, this is easier than SON hubs, where the wires need to be crimped to spade connectors; although the dis-advantage of this, is you need to be careful when removing the wheel, as you can pull the connector cap assembly apart, though it is reassemble.
For the tail light it's just a case of running a cable from the tail light to the front, crimping the appropriate connector.
Whatever you are looking at, have found with Dynamo LED's the light output is poor until it's really dark, then they are great.