It depends.
On game, shots in low light are usually not long shots, so you don't need to dope a complicated shot on the reticle. In that case, I like an illuminated dot with no illumination on the whole reticle - like the IOR 2.5-10 or the Accupoint scopes by Trijicon.
On hogs, shoot at any range (where a shot can safely be taken), that means a ranging, doping reticle is nice and illumination across the reticle is good.
Most of my hunting rifles have illuminated reticle scopes. Better to have and not need than to need and not have. Late last year a friend w/o illumination had to take a shot on a hog with my rifle because he couldn't see the target in his Conquest and it was clear as day in my Hensoldt - with a dimly lit red reticle overlay. It was his first hog.
Lastly, get good illumination. Many companies who make decent scopes offer illumination, and many are all but useless in low light. Nothing mentioned thus far fits in that category. Countersniper does, and the old IOR scopes (great scopes) had terrible illumination - way too bright to use in low light.