Depends. Do you need the 18mm wide (27mm wide)? Generally speaking 24mm (36mm) is barely wide angle. Both lenses have excellent resolution. Both have VR. I suspect the 24-120 is a little sharper - and it has a constant f4. I also believe it is a little heavier. Your call.
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Steve Bingham www.dustylens.com www.ghost-town-photography.com