This is a six of one, half dozen of another senerio.......
Scopes will help you maximize your guns pattern at 40 yards for sure, and they will help you pick out that gobbler. However, there are drawbacks....
One is a lack of a FOV. You are limited to only what you can see in your scope, nothing more. Scopes are heavy, and can really be a pain after a long day of turkey hunting. The last thing is they can make you grossly missjudge yardage.
Don't get me wrong, I love scopes, but after being really objective with myself, I settled on a red dot. The upsides of the reflex red dots are no limited field of view. You can see everything around your target. They are also very light compared to scopes, and no magnification allows for less yardage errors.
Lastly, just put the dot on the target, and pull the trigger. Once the dot is sighted in, where you settle that dot on the target, is where your pattern will hit.
Just some things to think about......