The Nectar Connector is another version of the crimped-wire pigtail. This means that it will have slightly less conductivity compared to soldered-wire pigtails but has the benefit of being harder to plug in batteries backwards.
Here's what NBD has to say about it:
The Nectar Connector is a custom mold design with thicker plug walls that makes it literally impossible to plug a lipo in backward without breaking the battery side plug first. Never again will you fear if you have plugged in the right way and risk burning your FC.