One pin adjustable sights are great for 3d-you dont have other pins clogging up your sight window,but for hunting I would not recomend a sight that you have to adjust,in fact I would strongly recomend against it, as for 3-5-7 pin sights,it depends on how far you want your bow sighted in for,obviously you`ll start at 20 yards so 3 pin sights limit you to 20-30-40 or 20-40-60 ,5 pin sights are a little more flexible ,7 pin sights are great if you want to shoot long distances but your sight window begins to get messy,you will need to get used to counting down so as not to use the wrong pin. I use 6 pins set for 20-40-50-60-70-80 the 50 yard pin is the only one that is not green or red so I use that as a referance point to quickly put the right pin on the target