Crimp -- or Solder?

[Chris09]

I think both of these are Klein. I carry the blue one in my pouch and crimps well enough for low amperage control stuff. Anything ground sensitive strands will be bent over [doubled] or higher inrush motors compressors gets the red black pair. I'll give it a little less crush through for high inrush loads.
"Stab em in the back" I was told by an electrician. Set the pointy part on the side of the terminal opposite the seam if you can see one.