To the best of my knowledge on this subject.I believe the straight tips Aeroflat will be better for more lift as you have more blade out there so it will take less pitch and it will have a better auto hang time from MORE blade out at the end. Takes less pitch to run and can load up the motor more because of the extra piece of blade on the end (not curved or angled, less blade).
The curved tips came out next and they were better for foreward flight and used less motor power as less blade out there at the end so it cuts through the air better. Good overall blade.
The Angled tip is their latest design and I guess if it is the ones with the yellow or white coloring on the ends they are designed more for our newer 3D style of flying.
Now they may all have different AIRFOIL shapes (blade chordewise thicknesses) to them as well so that will make a good difference as well.
Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!