From my limited experience in both I can say the following
The EC120 doesn't have as much power as the 206,VEMD on the EC is good. One thing I find a help is the recording of a "gong" if you pull too much power for too long, at least you know when someone has done something bad, whereas in the 206 you wouldn't have a clue. If you're the only person flying the A/C then it's ok, but if you're at an operator that has many pilots of varying levels I would prefer to know if someone has wound the machine.
Aircon as standard in the EC is nice, specially in Africa and it seems to work well, does drip every now and then, the door ejectors are also cool if you're autorotating with an engine failure into water without floats(I know that should never happen but it just did in Cape Town a month ago and a student died)
What I don't like is that the rotors turn the other way, nothing major but as you enter an auto and you instinctivly push in the pedal/which one was it again
you sometimes get a surprise when it yaws the wrong way.
EC is also like the Squirrel, comes off one one skid first whereas the 206 comes up straight normally, you also have to give a good bit of right pedal when you're pulling power for the lift off so that you don't cause a problem (something to do with the Fenesrton effect).
Shutdown in the EC is way faster than the 206, that two mins at idle in the 206 is 30 secs in the EC, if you're doing short hops it all adds up.
Seats in the EC also have some kind of loading structure that if you come in hard in an auto they collapse a certain way to protect you, someone with more knowlege can ellaborate.
Auto's in the EC are FAST compared to the 206, the fall out the sky, the 206 seems to glide more
If I had to choose I suppose it would be the EC for me, but that's because the EC I fly only has 200hrs on it and the 206 has 3500hrs. If I really had the choice it would be an AS350.
My 5 cents
