You have been given good advice about using a 3-9 set on 6 power, since you already have one it using it is a no-brainer. Unless you are planning on night hunting there is no overwhelming reason to have a lighted reticle or a 56mm objective. Quit obsessing, get the 3-9 mounted up and get out and use it.
drover
Understood! I tend to overthink things sometimes!