I've not used either Bushnell model, but I do have an opinion, for what's it worth, about scopes in low light situations. That is you will loose the reticle long (up to 5-10 minutes depending on background/conditions) before you loose the ability to actually see what your shooting at. This is especially so with the relative fine style reticles used on most tactical scopes.
This can be alleviated by using a heavy hunting style reticle like a German #4 in a non-illuminated scope or illuminating a fine tactical style reticle. I would expect the plainer cheaper Bushnell LRS 3-12x44mm, which I do have, to be vastly superior to the HDMR or XRS in low light situations mainly due to it's illumination. It may be inferior in all other aspects, but when talking in the narrow scope of low light situations, illumination trumps anything else available.
In low light it does not matter how big your objective is or how much light it transmits, if you cannot see your reticle to aim, your done for the day...
IMHO and YMMV