The Dex-crud is supposedly "long life" and is more "aluminum friendly" because it has no silicates. Both green and orange antifreeze use ethylene glycol as the antifreeze element but Dex-cool has no silicates and uses OAT (Organic Acid Technology) for corrosion protection.
After a period of time, silicates drop out of the coolant and attacks lead solder joints in radiators and plates aluminum radiators and heater cores. The more extensive use of aluminum parts in modern engines and cooling systems is why they claim the green stuff with silicates for corrosion protection needs to be changed every two years.
I replaced my 1991 leaking brass heater core with lead solder joints after 150,000 miles and the new replacement heater core was made of aluminum with aluminum solder joints.