Ameyam, It might help if everyone knew what you were after. In other words. Do you want all out 3D? A sport flyer? Or maybe a combination of the two?

1) On the bipe you add the two wings areas together. the rest you got.
2)The Reactor Bipe has a smaller wing span because there are two wings. If you look at scale planes or full scale even. I single wing is going to have close to the same wing area as a bipe but all that area is on one wing. If that makes sense.
3) I fully symmetrical wing is better at inverted flight. The AOA is higher when inverted on most planes, but it is higher on a semi symmetrical or flat bottom wing than a fully symmetrical.
4)If your speed is up the bipe, it will be as good or better in a turn. Most have struts that go between the top and bottom wing and these increase side area which helps on knife edge and steeply banked turns. The difference is in the amount of drag. Where a single wing plane you might cut the power half way through a turn to land and it will glide in. I bipe will slow down a lot faster. This is because of the drag of having two wings. So if you cut the power in the turn with a bipe, it may fall out of the turn due to lack of airspeed.

david