A few other things to consider:
Autorotation - ever seen an EC120 auto from about 10-15' AGL? Talk about slamming you into the ground! You'll find the 206 offers much more margin than the EC120 due to the nature of the rotor system. Much more inertia in the 206.
Useful Load - Don't get hung up in EC telling you that the 120 has a greater AUW. Once you load it with the necessary equipment and fuel to fly it away, you'll have more UL in a JetRanger with the same equipment. This is especially easy to see when comparing Bell and EC's HOGE and HIGE charts from their technical specs. You'll find a tight race, but I suspect EC would tell you differently.
Having flown in both, I would not take an EC120 above 110-kts. It seemed like everything was about to shake loose in the cabin.
I'd take the JetRanger.
