First, my post was in response to one specific post of yours, wherein you refused to justify your position on certain grounds. And all I did was point out that those grounds, as you stated them, indicated that your opinion ranked even higher than God's. It was a comment on your specific argument in that specific post.
However, I will accept the challenge if, as in your debate with lasthero, "best" refers to "the best of all possible worlds." Because I can imagine better flyers than the birds and bees in our world. The aerodynamics of man-made aircraft began in imitation of flying creatures --mainly airplanes in imitation of birds -- but they don't stop there.
VTOL and hovering are not possible (except in specific and unusual wind conditions) in anything in nature larger than a hummingbird. Because the creature (hummingbird, bumble bee, hummingbird moth) needs to beat its wings so fast that a larger creature's larger wing would shatter. In artificial flyers, we get around this by exploiting other aerodynamic principles, and so we have the Osprey aircraft and the helicopter.
Even in straight flight, in direct competion to designs based on (and improved from) the basic "bird-shaped" airplane, the design which prvides maximum speed and fuel efficiency is the delta wing, which has no direct counterpart in nature.
So if it were just a matter of design, and nature allowed for animals that could not have evolved incrementally, it is easy to imagine delta-winged flying animals, or rotary-winged hoverers, etc. The eagle is the best flyer nature has produced precisely because it was produced by natural means -- by evolution.