2560x1440 is standard 2K, it will match 2K monitors, so if you have a 2K monitor then it may be the best choice.
2560x1600 ... I suspect we only have this choice because some other dashcam manufacturer provides it and Viofo didn't want to be beaten on resolution!
2592 x 1944 ... This is the maximum resolution the sensor can manage, so records the most "detail".
However, all these will be at native sensor resolution, with one image pixel for each pixel on the sensor, the only difference is that the top and bottom have been chopped off, and a tiny amount of side for the 2K width resolutions, just to make them standard. If you do not need the sky, because you are not recording meteors, and do not need the front of your car and part of your dash in the image, because they never change and there is nothing interesting there anyway, then the extra pixels are useless! And since they use up a small amount of the bitrate, the best resolution of those is probably the standard 2K.
There is also the 2560x1080 resolution, which is also at native sensor resolution, but with even more of the meteors and some clouds chopped off, which should free up quite a bit of bitrate for improving image quality - that should really be the best choice...
I haven't done a proper test on them all, so that is somewhat from theory, if you notice that it is wrong then discuss...