I prefer the Ace connector with the two set screws on the barrel and the heat shrink sleeve. In a pinch, HD has barrel connectors and Raychem shrink sleeves that work the same. No wire nuts of any kind outside of a J box.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738