There are people on this forum who know roughly 748 times more about scopes than I do. But I'll jump in anyway.
The difference between 3-9 and 4-12 is one-third. Not huge If you look through the scope at something 50 yards away, and you change to the 4-12, it will look as though it were 35-40 yards away but clearer. By the way- all those numbers are approximate. My 3-9 Redfield revolution says it's actually something like 3.3 - 8.8. I don't remember exactly. The difference is not huge. If you buy that scope you're giving up field of view say under 60 yards, and getting a bigger picture from there to whatever your maximum range is. Personally I chose the 3-9 because I'm a hunter and I would be very careful about shooting beyond 150 yards. I hope to shoot at sixty or closer, and for that I want all the field of view I can get. The 2-7 is attractive to me for that reason. Choose the right magnification range first. Don't buy the wrong scope just cause you got a great deal.
You don't say what you want to use it for, or at what range, which makes it hard to give more specific advice.
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