Electrical solderless or soldered connectors

If you want to talk about the most reliable type of connection with respect to solder vs crimp, go look at aircraft and military equipment in general. They are soldered. HOWEVER, as already stated, vibration will kill a soldered joint, which is why the wires/pins are all the way in the connector housing and fully supported.



Vibration at the joint is kept to a minimum. Most people aren't going to use mil spec connectors on their duster (though I have seen it and I would do it), so we are stuck with blade/barrel connectors generally. These are going to vibrate like crazy and get tossed, pulled, moved etc. in that case, a good stranded wire on a "properly" crimped connector will be absolutely fine and it's the proper thing to do. Solder on those connectors isn't required. Properly supported (shrink wrap, even double layers) they'll work great but again, they need to be done properly.

So, just as people are saying, right tool for the job, it's also the right connection for the environment in which you are working.