The original fan is the preferred on IMHO. I had a comment asking for a "Silent" fan. The Noctura fan is one such fan but the airflow is 50% of the original. Another comment expressed concerns that the enclosure internal temperature was rising too much for the Prusa i3 MK2S MMU. The third fan was introduced to double the airflow at the expense of noise levels. I have elected to stay with the original fan for my printers.
All fans support the speed controller so even with the highest flow fan, speed can be adjusted as desired with a commensurate reduction in sound as speed is reduced.