Odyssey+ is the best for visuals at the moment (Reverb being #1 but we have not have any feedback on that yet). I have seen several reports of the Rift-S not looking as nice as it still has a lower resolution than the O+ and no anti-SDE filter.
As for the misaligned eyes, this was an ED problem and they added a fix for it. When you load DCS for the first time, you will have a window that is open. Click the mirror left eye and then click save. Done.
Head tracking is perfect, just make sure you have good lighting.