You said you only use 3X to 4X for hunting. Why would you box yourself in to a fixed power scope at greater magnification and therefore less field of view?
There has been a long litany of pushing the fixed 6X for big game hunting. Keep in mind that some shooters have poor eyesight and need the magnification to try and make up for that. Others only hunt at longer ranges or have some zeal or need to push fixed scopes.
I have all kinds of hunting and target scopes and in fact was 'blessed' with a fixed 6X on my first CF hunting rifle. It bothered me in the woods. I could not pick up moving game in an easy way. Back then there were few variables and I found that the 4X scopes were just right for me.
Go with a variable as thats what almost everyone else does. They do it because it is the best choice for hunting.
