Another thing that confuses about the crow:

1. During considerable high alpha low air speed when ailerons are both up, the crow reduce early separation over the wings therefore delaying stall and increase lift as well...
2. during the above (#1) phase, the effective surface is lesser therefore lesser drag. Lesser drag means lesser engine power...

Negative effect of flaps at high angle of attack:

1. Increase air separation over the wings therefore promoting stall.
2. Drag is also increases therefore more power is required.


Differences:
Crow - decreases camber
Flaps – increases camber

Reducing camber increases stall AoA and increasing AoA increase lift up to approx 100%. Furthermore, increasing camber increases lift for approx 200% based on approx wings coefficient of lift.