OEM is dot4. Dot 4 super has a much higher boiling point both dry and wet. Dry is when new (unused), whereas wet is used fluid, ie it has taken in moisture from the air.
There is no advantage in using super dot4 unless you are racing or doing track-days.
The fall off in performance over time, because of moisture lowering the boiling point, is the biggest factor for all users. Please, please, please, change the fluid, as recommended, at least every two years.