Over the years, I've driven several vehicles into the ground. Not one of those cars stopped running because of bad coolant. Water pumps, thermostats, hoses, and even radiator tanks go out eventually. There isn't one coolant that will prevent any of those things from failure due to wear & tear, or age. Rubber hoses will deteriorate and crack. No radiator could last forever with the right coolant, and there isn't a right coolant that will make your radiator last forever.
When in doubt, buy the most expensive thing that you can and hope that you did something good. After all, what is the price difference between a top shelf coolant and a bargain basement coolant? If you're still unsure, then slip some of it into your girlfriend's Gatorade when she's being a bitch.