Technically speaking properly crimped joints are better than soldered. But that is assuming you use suitable sized crimps for the cable, which incorporate strain relief for the cable. However, weatherproofing can be problematic so personally for vehicle wiring i prefer neatly soldered, heatshrinked immobilised joints as well.
In my experience, soldered joints only fail when they are a bit bulky and exposed to vibration.
Slightly more on topic, and I hate to sound pessimistic to superlooms about all this but it sounds a lot like you are selling bundles of wire. Have you got any pictures of the made up looms? What are they loomed in? sleeving, spirawrap, flex conduit?
Cheers
Chris
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