Flaps allow more lift at slower speeds but with a substantial penalty of drag and do not allow higher angle of attack.
Slats allow more lift at slower speeds by allowing more angle of attack to be utilized.
My argument is . . .
Angle of attack is not the important factor. Both devices alter the lift and drag profiles of the wing, and what ends up being important are things like what C_L_max is (at whatever AoA), and what max L/D is (at whatever AoA).
Also, I don't think that there is a way for anyone, by feel in the game, to figure out whether or not flaps or slats are incorrectly modeled (unless they are drastically off, which I doubt).
I don't have the exact numbers but neither does anybody else on this thread.
Years ago, there were arguments that "the F4U turns better than it should, especially with flaps." These arguments were made by folks based on feelings and personal intuition, but without any knowledge of the basics of aircraft dynamics. So, I decided to take a crack at it using standard, well-accepted aircraft dynamics to see if they agreed with the performance shown in Aces High -- including stats with and without flaps deployed. They do. It is also a decent overview of some basics of aircraft dynamics:
http://electraforge.com/brooke/flightsims/aces_high/stallSpeedMath/turningMath.htmlI could probably do the same picking a 109 and including the modeling of slats. I'll look at it at some point and, if it's not so much work, I'll take a crack at it. First, though, I'll probably work on adding more accuracy to my analysis given above (adding some more-picky factors to it, making it more akin to this:
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930092640_1993092640.pdf).
In case of any interest, some of my favorite books on aircraft dynamics.
Airplane Performance Stability and Control, by Courtland D. Perkins and Robert E. Hage
Theory of Flight, by Richard Von Mises
Fundamentals of Flight, Second Edition, by Richard S. Shevell.
Aerodynamics Aeronautics and Flight Mechanics, Second Edition, by Barnes W. McCormick.
Introduction to Flight, by John D. Anderson, Jr. (best introduction to the field of all books of this list)