CT,
You are getting good advice here. To crystalize the concept is thus. The chief attributes of the telescope are 1) single focal plane (target and reticle are in the same focal plane. 2)Resolution-The ability of the scope to distinguish the target from its background. 3)Light gathering. The ability to see your target earlier and later in the day. Against this are weigh and bulk. A scope with rings and bases will add about 1 lb to to the weight of the rifle, making it more "unhandy".
In my own case I 've gone with the peep or ghost ring to save bulk and increase "handiness". I have found that I can see my sights about 15 minutes after sunset. Thus the savings in weight are more important to me then focal plane, resolution and light gathering. Remember a deer or othe big game is a quite large target, so seeing it is usually not a problem. I've tested myself, and I can see my front sight about 15 minutes after sunset. A scope makes more sense, if you are shooting rats in woodpile or squirrels in an oak tree.