It's never better to have no safety chains. You don't want the trailer to go off the roadway or into an opposing lane. The safety chains prevent that from happening.
I have been in a truck when the trailer came off the ball. The utility trailer broke the chains loose as the truck was slowing and careened off the right side of the road and through a highway sign, coming to a stop ahead of the truck. If the safety chains and connectors had been in good shape, the trailer would have stopped in back of the truck with much less damage. If that flat bed trailer had swung left and entered the opposing lane, any head-on traffic would have been in dire straights.