I have been down this path.

1. in the dark a day scope without NV capability can see nothing, why I carry a pistol with a laser on it when walking out of the stand.
2. 50 mm objective with a poor coatings will not match 24 mm objective and excellent glass and coatings when the light is waning....so the VX6 24 will see as good as the VX2 50 (probably)
3. a Thick reticle is best for lower light shooting, some IR are OK as well depending on how much you want to spend.
5. a red dot sight in low light is a trick, to keep the thing turned down as the light fades.
6. Shooting pigs at night with a good green or red light, it don't matter what scope you use as long as you have a good light and shoot reasonable distances.