Crimping is pretty easy if you have the right tool - not the "free" one made from stamped metal that comes with those cheap boxes of red/blue/yellow connectors, which crushes the connector flat rather than allowing it to retain the springiness on which a good crimp relies. I'd say that it's easier than soldering, but the tools are roughly comparable in price. However there is rarely a choice to be made: if you're attaching to a circuit board you're going to have to either solder wires on, or solder a connector (even if the wire or cable going to the connector is crimped). I just use crimping for motorcycle electrics, where vibration is an issue.