The use of solder or crimps will lead to long discussions on forums with people leaning both ways. I've seen plents of arguements both ways and many valid points. For example some some say its not the fact that a wire was soldered that causes the movement/vibration failure, its due to solder wiking up the wire and that a properly soldered joint won't have any issue. Its more due to field reparability, with a crimp tool a perfect crimp can be made most every time by just about anyone but it takes a lot of skill to make perfect solder joints every time. I've used both methods and seen failures in both so I can't see where one is absolutely better than the other.