Graphically (only) is Wing of Prey below or equal to the quality 'we' expect for SoW?

[Feuerfalke]

It depends on what you think is "better".

WoP is a game that tries to simulate the in-the-airplane-feeling as most people today know it: As shown in the many war movies, slightly blurred, desaturated and a touch of WW2-Gun-Cam-style.

BoB on the other hand will simulate what it is like to sit in a real plane. The world is not tainted in sepia brown (unless you have grey star or something) and you don't have a vignette-effect on this field of view (again unless you don't have some serious eye-problem).

Cinema or Reality - your choice - neither is better or worse IMHO. It just depends what you're looking for: Feel like a fighter-hero in a movie flying by keyboard or immersion and realistic view.