A single pin sight is usually used for 3-d target shooting. I have had one on one of my hunting bows, and I did well with it. The best place for using that type of sight is where you are hunting stands that only have a “one distance” shooting lane. Such as in a hunting area that is SO thick, that there is only one spot for a deer to walk by, and that distance is known by the hunter. For example lets say 25 yards. So you have your one pin sight set up for 25 yards. In my opinion, in this type of hunting, a one pin sight is the best. Reason being, if you have a monster buck come in, and you get buck fever, you don’t have to think about which pin you need, and possible grab the wrong pin, and shoot over or under him. If you read a ton about bowhunting you will find a lot of big animals are missed by a bowhunter “grabbing the wrong pin” after getting buck fever.
Three, or five pin sights, is a matter of personal preference. I use a five pin sighted in at 20,30,40,50,60 yards. I am confident in my bow at 60 yards and I shot two does last year at 60 yards. Both of them I recovered. With a three pin, there would be more guessing/estimating in between pins. The five pin suits me perfect. Also- I would suggest getting all green pins, you can get replacement fiber optic’s for most sights on the market, and all you need to do is order five fibers of green. This will help eye focus as well. There are also some amazing things you can do to fiber optic’s to modify them, and make them better and brighter.
A lot of the bow shops should have sights set up some type of bow/handle set up. I suggest going in to a bow shop and checking them all out- Check to see which one fits your eye focus/vision the best.
Last, but in my opinion- most important- durability- I don’t want my sight going down on me, in the middle of the rut. I spend more time bow-hunting than anything else. My equipment is hunted hard, and that is why I recommend Spott Hogg- It is the most durable sight on the market-
I am sorry for such a long response, but hopefully this helps a little, and if you have any other questions, there are a ton of great hunters on this site- don’t hesitate to ask!!!!