Here's a little more "broad-minded" response. (Sorry, Matt not pickin' on ya)
Actually, the ND 109 has more features and options, and variants, if you do a comparison of the two.
The 109 has rain effects on the windshield, and fogging, nice sounding and lengthy wind up from a cold start, well, autopilot that sort of works, etc.
There are a lot of repaints available for the 109 if you look for them.
I actually like the look of the VC in the 109 better than Cera's 222.
It seems to have crisper detail, better textures.
That being stated, Matt is absolutely right on this, the flight dynamics are not very good for the 109, unless you enjoy looking at the ground at cruise speed.
A promised patch has yet to be released, soon going into the 4th month of waiting now.
We've been assured that the patch is being tested for the past few weeks now on the Nemeth forums.
Unfortunately this is a very typical pattern for Nemeths, for the past couple years.
I can think of several of their products we have been waiting
years now for patches, especially the EC120.
Needless to say my confidence in Nemeth is waning as well.
The Cera 222B is very nice, but again it seems to suffer, slightly, in flight dynamics.
Cera has released an update already (within days of release) to correct some reported issues with it and it seems better, now.
I still think the FD .air file Jordan Moore created over at Hovercontrol is still better, IMHO.
However, there is just something I can't seem to put my finger on yet.
I just don't enjoy flying the 222B as I expected I would.
Compared to Cera's other products, the 412 and 212, I actually prefer the 412 best of all.
But between the two right now, the 109 or the 222, Cera's 222 is the most flyable and probably a better choice.
IF the 109 was ever given an accurate FD with rotor torque, I would still actually prefer the 109 over the 222, personally.
//-------------------------------
Oh, I would like to mention ND's MD500 for FSX has rotor torque now, due to an updated FD posted by Nightsta1ker over at Hovercontrol.
He actually has hours in this type, so the new FD is very well done. No more 'nose high' to stop the lil beast.
I can strongly recommend if you have the Nemeth MD500, to run not walk over to Hovercontrol, download and install these new .cfg and .air files.
Make a backup of your original .cfg file of course for transfer of repaints, Shockwave lights locations, etc.