This thread is kinda like asking if you like blonds or red heads...to each his own.
I used leupold 3.5-10's for many years, rarely put them on 3x.
I owned 1.5-5, 2-7, and 2-8, they lasted a season...they were gone.
I went to the Burris 3-12, leupold 4-12, and leupold 4-14's, never looked back.
We hunted Mexico for 12 years, Az, Ca., Nv, and other Western states. In close cover, I used a shotgun a lot.
A lot of what power scope you like to use depends on your hand and eye coordination and how fast you can pick up a moving object in your scope...everyone is different. New guys always have better luck with lowered powered scopes. I noticed over the years that guys that have shot in various shot gun leagues have developed great hand and eye coordination, I noticed that these guys do better with with higher powered optics.
My yote rifles are also crow rifles, jackrabbit rifles, chuck rifles, etc. I have shot a lot of crows in the range of 250-350 yards. When you are shooting a low powered scope, the crow can be no larger than the intersection of the cross hairs...not a good thing on smaller targets.
No doubt that the bushnell 6500 in 2-16 would be top of the line yote/varmint optics.
There really is no right or wrong, you just have to find out what fits your particular way of hunting.