The topic of soldering versus crimping is often debated. Those who prefer crimping are in the good company of aerospace, military, Forumla 1, and medical.
A key advantage of crimping over soldering is the ease and speed with which a properly formed connection can be consistently performed. I have seen far too many people get soldering wrong. With proper tooling crimping is nearly foolproof. I too can produce reliable soldered connections, but they are much more of a PITA to get right (getting heat into wire / terminal, ensure solder doesn't wick past terminal stem, venting fumes, not burning myself or car when working in compromising positions, etc.).
I'd also suggest that there's a reason you see almost no soldering connections on the vehicles from the factory. Many times I've seen salt and corrosion destroy a solder joint, where a crimp would have lasted a lot longer. And then there's the vibration, and I've had solder crack on more than one occasion. That's a failure of the solder itself, and has nothing to do with the preparation of the solder joint. The solder would have cracked whether it was on a joint or not, when exposed to those same vibrations.
