As you can tell the opinions are about split 50/50, and probably will remain about that through out the comment string. The truth is that either will work fine. I have hunted very little where 300-500 yard shots were even a possibility. Most of my hunting is far tighter than that, with a 200 yard shot being "long". My vote - 3-9x40.

As already mentioned adequate eye relief is critical, as are clarity, a chrisp image and peroirmance in very low light. Buy the best that you can manage. You will not ever regret having done so.