To measure the "brightness" on a bino you divide the size of the front element (IE 36mm) by the magnification ((7x) that gives you the exit pupil, or the size of the circle of light that will hit your eye. So the Nikon and the Swift are about the same in that respect. (5.1 and 5.2 mm)
Considering that, the 7x at the slightly lower magnification might be easier to use (less "shake")
Since with binos what you see is what you get, ideally you should test one against the other.
Leica still assemble their own binos as they have done for decades. I think it is all done now in the Portuguese factory.
Trinovid is no more, the new designation is Ultravid (new coating)
(I visited the production line within the Minox factory ,in Germany,when they owned that brand)
Franco