The Avenger is really just a "Predator lite". The design of the two discs are nearly identical and the wing size is the same on both except the bead on the back of the notch on the Pred is larger. I have found that if I use the variation of the plastic, I can use either the Avenger in a certain color/plastic or a Pred in a certain color/plastic to get the same flight. The only thing is that the Pred will be more consistent in the wind holding the same line because of the size of the bead at the back of the notch.
Now that I am finding a little less stable Predators, I am eliminating the need for the Avenger. I never expected this...
I wonder if most people realize the Flash and Surge have exactly the same size wing, so they effectively have the same speed. I have found the ESP Flash to much more versatile than the Surge, and the Surge aint bad!!!
First of all, what exactly do you mean by a bead? Rocs have beads, Aviars have beads, but a Predator? I take it you are referring to the increasingly sharper concavity towards the bottom of the wing. Anyway, this is not the only difference b/w the Pred and Avenger. Look at the wing and notice that before the bottom of the Pred wing gets concave, the outside part of the wing is almost convex. This somehow gives the Pred stability and speed because the first runs (original Pred mold) were different (straight rather than convex front wing). I think that the Predator is faster and has more carry than the Avenger because of the convex front part of the wing. The Predator also gets what I would refer to as lift or an air-bounce right out of the hand, that an Avenger does not. Switching a year or so ago from the Firebird to the Pred I really had to adjust to that lift. On a sad note, I lost my 1.4 years seasoned Pred last night...
About the Flash and Surge: The Flash is a truer flyer, but the Surge is more HSS. They are both versatile depending on your armspeed.