ORIGINAL: MGH_PA

It all comes down to personal preference and comfort. For me, I like to be able to hold the bow straight out, and draw back without lifting the bow. To me, that's a comfortable weight that I can be assured of being able to draw back with cold stiff muscles after a long sit on stand as well as allowing me to hold at full draw for a considerable amount of time if a situation presents itself in the field.

You can kill a deer just as dead with a 40lb setup as you can with and 80lb. Obviously there are downsides/upsides to lower DW and higher DW, but really, it comes down to personal preference and comfort.