I can tell you what I don't like about either one, that is they require a 56/44 mix ratio versus the standard 50/50. Why do I dislike this? Because although this coolant may protect longer, it will have less thermal transfer efficiency due to less water. To me, even cheap Dexclones will protect the engine fine, we really don't need something beyond that to have an engine go several hundred thousand miles without cooling system issues. I know this from first hand experience, using Dexclones starting around 2007 to present (never had one single issue and all the cooling systems I've used it in are pristine). But having less heat transfer capability may make a difference over the long term, when it comes to things like head gasket longevity.
I actually almost bought Platinum the first time I saw it at Walmart. When I carefully read the label on the back, I saw the required ratio and put it back on the shelf. If ultimate longevity is the goal, Peak Global Lifetime had that covered starting nearly two decades ago.