[Batfish]

Since the solder itself is the least conductive material in the chain, the less solder the better.
You need only one point of solder if you solder the wires to each other, but you need two points of solder to add the bullet connectors (one for the male and one for the female).

Personally, I plan to always use connectors because I move the setups between vehicles regularly and need to make sure I can plug one controller into different motors, etc...