I liked the clips too, actually I think they're pretty excellent. And although I personally dislike to use artificial reverb on classical, I wouldn't have guessed it if you hadn't told me; I would have believed this was natural acoustics.
Can't find out if I prefer the extra focus of the ORTF pair. Maybe the tonal character is a little better too, but I'm not sure, the omni recording also has it's merits. BTW how far apart were the omnis?
[do you have photos from the session?]
If I was forced to say something it could be that the piano could be a tad more focused and maybe have a tiny bit more weight.
If this is your first piano/flute recording, you've got a very good beginning!
Nice and atmospheric
Seems as if those AT microphones does a good job here, and maybe the 4022 is a good candidate for another thread:
Mid-priced pressure omnis?
If you have the recordings without EQ too, it would be easier to judge the microphones.
Best,
Mads