Please consider the value of what a leak costs: Fermenter temp out of control... likely dump the brew. Nine f*ing hundred dollars of glycol to refill the glycol tank..."ideally" when the refrigeration supply place is open.
Sucks. Been there.
This separate from the efficiency aspect.
I have PVC and hose. Just be sure connections are snug and safe. I understand ABS is more durable than PVC at low temps.
Do you feel lucky?