Look for vr flight sim guy on yt, he has a few breakdowns on those 2 plus the pimax. Keep in mind the price decrease was recent so older vids will be taking the old price into account.
Another thing to consider is the software powering the device. Varjo software is, simply put, incredible. Top of the line high end software that would be far superior to anything BSB offers.
There's also a ton of pre-established tweaks and fixes and setting adjustment by the community to get as much performance as possible out of the Aero for flight sim
Another thing to consider is PC hardware. Are you on at least a 3080 with a decent CPU? Also you need to be using Nvidia GPU for the Aero, not sure about BSB.
It has eye tracking, and its built in software renders stuff based on where you look. The eye tracking cameras run at 200hz. So the image will always be clearest where you look. You can adjust how clear by changing the PPD in the software, which obv needs more GPU the higher you go
The Aero has a smaller 'sweet spot' than other headsets like the Index, but it also has a lower FOV which contributes to this smaller sweet spot.
The image might seem 'blurry' on the edges because that is partially how foveated rendering based on eye tracking looks. Directly where your eyes are pointing will look clearest. Peripheral will start to look a bit blurry.