Originally Posted by D.T.
That first crimper you have is junk, the second one is the one to use.
I assume most solderless connectors are copper plated with tin? Tin keeps the copper from oxidizing?
Soldering is not good when there is vibration present?
Soldering is fine where vibration is present, the payload cone of a rocket is about as bad a vibration environment as you'll find anywhere, spacecraft have plenty of soldered connections.
Tin plated copper is the standard material, yes. Some applications are Silver or Nickel plate, but they all serve to protect the copper.
Crimping is easier and faster in a production environment, and takes much less skill overall.