Using spade lugs to terminate wires under screw posts
I find on stranded thhn if you strip the wire back but not enough to remove the jacket completely off the copper it keeps the strands twisted and protects the ends of the wire. Clip some of it back if it is sticking far off the receptacle but not enough to bring the copper back to the surface. Not sure if I described it good enough but off you can picture it, it helps greatly on screw terminals if you have to loop your wire, plus I don't trust crimp on connections, they fail often in my opinion