What are the pros and cons to the two types of Heet available (yellow vs red) used to prevent fuel lines from freezing in winter?

Yellow Heet contains Methanol
Red Heet contains Isopropanol (like rubbing alcohol?)

I’ve heard that the yellow Heet is more effective than the red but the methanol tends to dry out seals in your fuel system.

People buying fuel at the pump containing ethanol say that their engines produce less power and the fuel becomes unstable after long term storage. Does the use of Heet in the fuel system contribute to the rapid breakdown of the fuel like ethanol does?

What are the pros and cons to the two types of Heet available (yellow vs red) used to prevent fuel lines from freezing in winter?

Yellow Heet contains Methanol
Red Heet contains Isopropanol (like rubbing alcohol?)

I’ve heard that the yellow Heet is more effective than the red but the methanol tends to dry out seals in your fuel system.

People buying fuel at the pump containing ethanol say that their engines produce less power and the fuel becomes unstable after long term storage. Does the use of Heet in the fuel system contribute to the rapid breakdown of the fuel like ethanol does?