I'd rather bow hunt than gun hunt for a few reasons:
- warmer weather, no freezing your butt off (NH season starts mid-Sept). Bowhunting in those first cool October days when leaves are changing is awesome!
- challenge. It's plain and simple, harder. Sounds like you've got the "get close" part under control. But now that they are close, you need to draw, aim and shoot without getting caught. It's more movement than with gun (though that close a gun isn't a done deal either)

I'd rather gun hunt mostly because of the increased range. In some states where you see lots of deer, this wouldn't be an issue, but here we see deer MAYBE one in 5 hunts, and that's a good success rate. Now when you only see 2-3 deer per year, but they are hanging around at 40+ yards, that moves them to "saw but to far for a shot" territory. It can get frustrating.

As for effective killing, bows cause severe and sudden blood pressure loss and lack of being able to breath. I've shot deer that sort of just stood there apparently not feeling the arrow go through, walk a few steps and tip over. I've also had to trail gun shot deer, so it goes both ways.

My guess is MOST bad shots are from lack of experience shooting at a deer. You simply can't practice this without shooting at deer. My one and only lost deer with a bow was my fault. Since I've become more "calm" for lack of a better term, when shooting at deer, my tracking distance has gone down and success up.