Yes this is the only one if you are interested in using the media as a filter, in say a Gill mask. This is among the best....
But if worn as just a normal surgical mask on the face without any additional mods, the *as worn* filtration is is usually 60-70% at best, due to leaks at the sides. There would still be protection, but it'd be very short-term/minimal.
ie the same thing would happen even if you use KF94/N94 meltblown layer in a flat surgical mask. Still like 60-70%+ at best worn in stock form.
Many times, the way i see people wear their flat surgical masks on the street, i'd be surprised if it gives 50% filtration even......
Possibly 10-30% also can......
Bonus, it works like this in theory........just try to understand what the diagram below is trying to put thru
eg if delta takes 10 seconds to infect you in a maskless scenario (possible, already proven possible in epidemiological investigations, multiple cases.....these worst case scenarios are not common but it is not super isolated ), then with a properly sealed KF94 it might take 1000 seconds in a maskless scenario.
Or 1 min maskless, and 100 mins KF94 properly sealed
Or 5 mins infected pax masked, and 500 mins KF94 properly sealed.