Free: Contests & Raffles.
Clear sight picture is the biggest difference that i like. I have a dual pin spot hog that is like a happy medium between a single pin and a 3-5 pin setup. I like how i can shoot all the way to 40 yards without having to adjust anything if there isn't time but that if i can range i can even get a more accurate yardage to dial to which makes me feel more confident in my shot process. One caveat that i would take a good look at is if you range and animal and dial then the animal moves your going to either have to let down and range again or just adjust based on if they moved further or closer away. Also in the same scenario, say you ranged and didn't even get a shot, you have to remember to reset your dial back to what you practice with (my top pin is 20 yards and bottom pin is 35 yards). Otherwise if you go for a no range shot and you didn't reset your sight you are gonna miss and your going to swear off adjustable forever.I assume your buddies are all talking about a single pin adjustable sight and not a single pin fixed? If its fixed, I have never used one and don't know much about them.
I had a single pin slider for a couple years and like mentioned, the biggest thing that I liked was the clear sight picture and only having one pin to focus on when shooting. Its great for target shooting and pretty good for stand hunting but I switched back to a standard 5 pin with a floater. In a real world hunting application, especially on the ground, there is a good chance that you won't be able to adjust your pin based on a lot of in the moment factors like coming to full draw on an animal before it comes into the opening you ranged and having it change course to a different opening with a completely different range. Very unlikely you can let your draw down, adjust your pin and draw again with much success. I will say that this really only pertains to shots 40 yards or so plus because under that, its not super difficult to just keep your pin set at 30 yards and adjust your hold point accordingly. I left my pin at 30 when practicing and would shoot from 20 to 40 yards so that I got comfortable where to hold.
What's your honest maximum effective range If 60-65 is your max under hunting conditions you could just delete two pins from your fixed site.I've done this before and it's easy to get confident with a 20, 40, and 60 pin.
There's a few advantages and disadvantages and a lot of it will depend on the archer and their style of hunting. Sight picture and the ability to dial to any yardage is an advantage for some signal pin shooters. Spot hogg makes a set of 3 vertical pins called a triple stack that gives you the sight picture of a single pin but the advantage of a multi pin sight.
I use a single adjustable but I think I like it because I shot a stick bow for 30 years and the last 10 years shot point onWhen still hunting Elk or Deer my pin is always at 30 yards. When spot and stalk my pin is at 50 yards then keep dialing as I get closerIMHO there are more cons then pros but I still choose single pin because I shoot them better at practice and huntingPros:Clearer sight picture, with a fast bow the pins are too close together for meDial to exact yardage so no need to split pinsCons:Sometimes cant dial when animal changes distanceForget to change the pin back ( never done on an animal but have done at practice )Bottom line is do what works best for you as everyone is different