Hi,
In the past i've worked with 30,000 watts (that's thirty thousand watts) inverters that used ALL crimp connectors for everything. The crimping tool was quite expensive however.
You can know if the crimp is tight enough by doing a simple test. Well, sort of simple. You have to run the equipment at full power so that the cable is drawing the maximum current it will ever see. You run it for several hours (overnight is recommended for a mortality test) and then feel the connector body with your hand. If the crimp is bad the connector gets very very hot, but if it is good it stays the same temperature as the wire. With today's IR temperature guns you might even be able to measure the temperature with that. But if the crimp is bad you'll know it.
If you worked with small alligator leads a lot you would notice that the alligator clip breaks off of the wire when the lead is soldered on, but if it is crimped on it stays on there longer. That's because the crimp allows a little more flex near the joint.