Ask three people, get three answers. I'd go with the NT1A. The reason is that in order to record realistic versions of such noise, you want room/corridor acoustics to participate and that results in some seriously quiet levels.
When I first set up recording with a Røde NT1A, I tried setting the gain and had a disturbing ticking noise. It turned out that a corridor and a stairway away there was a kitchen clock I needed to disarm in order to get close to the noise floor. That's the kind of stuff you want to capture.
Now if you rely on electronic reverbs/rooms to get your ambience, you may want to record from close up. However, you don't want any proximity effect coloring your noise, so if you are trying for close-up noise sources because of getting them mostly without a room ambiance, you would take a small-diaphragm omnidirectional microphone (which are actually not cheap once you want a low noise floor).
It depends on your project which approach to take, but of the options you list, I'd likely take the NT1A and use a solid distance.