Truthfully, at this time I don't feel equipped to make a judgement on it.
I have no personal experience of Cinego, and there are limited reviews out there. The general buzz is that the visual experience is very good, but the in-built player functionality is very limited. I also heard that they run quite hot.
I have only had limited personal experience with a pre-production model of Cinera, so while my experience was very good (with a few issues that I believe are going to be resolved for the final production models) I still don't feel qualified to give a final verdict on Cinera either.
The only headset I can really comment on is the Sony HMZ-T3W, which is an excellent product, with my only complaints being that the resolution is a bit low (720p), though still watchable. Also, the headstrap is a bit uncomfortable for me, but then I have a big head!
What I would like more than anything is to try the final Cinera AND the Cinego and compare them directly. My first priority is screen quality. I'm happy to use the HDMI-IN on either of them and let another device playback the video. I'm not even that worried about portability, as I would probably use the headset at home mostly (or at a hotel, etc), but not on the move.
I've been intrigued about the higher resolution LCD (Cinera) vs lower resolution OLED (Cinego) image quality comparison. Also, how well both units cope with lower-bandwidth, compressed streaming video and lower resolution video. Cinera displays those bright 4K videos that Samsung and Panasonic and LG release to showcase their latest TVs beautifully. The video is probably being downscaled (presumably to 1440p), but it still looks incredibly rich and vibrant with very crisp and sharp detail. I have a 55" 4K TV, and the picture quality seems pretty similar with the right video footage.
Where I would really like to see both headsets tested is with fast-moving action scenes with lots of camera movement to show how smoothly it is rendered, and darker footage that would reveal the relative contrast and black-levels difference between the OLED and LCD screens.
I'm sure both headsets produce what will be industry-leading screen experiences (until someone else comes in with a higher quality headset that tops the specifications of both). Native 4K is still achievable with next-generation graphics hardware, and as OLED becomes cheaper, we might even be treated to 4K OLED screen technology eventually!
But for now, I'll have to wait and see what my production Cinera is like, and try to get my hands on a Cinego, which in my opinion is the only direct 'personal cinema headset' competition at this time.