Depends on your engine. As a fast and loose rule nitrate free is better for more modern engines and generally recomended overall. While nitrated is only better for older rigs running green in VERY specific cases such as a case where corrosion is an issue….at least in MY experince.
I tend to prefer nitrate free and switch my equipment over whenever i can, unless i have a good reason. Otherwise because of how much of the guts of engines and cooling parts is made of aluminium now, including many modern replacment parts for older equipment. There are cases a bad batch of over nitrated coolant can screw things up badly, seeing as nitrates CAN damage aluminium parts.
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