The Krytac has better trigger response and its a combination of two things. The first is its exceptional motor and gears that makes it fire at around 25 rps. The second reason is the trigger pull is relatively short. The ICS APE on the other hand has a pretty standard low end motor and the usual long trigger pull so while it does precock it doesn't feel fast in comparison to the Krytac which has some of the best response I have seen from a stock gun.
The ICS precock is also a bit of an issue if you use it on sites that are only semi auto, you get a double shoot on your first fire and that often makes the marshals pretty annoyed if they think you are on full auto. I have to fire the first shot at the ground before the game officially starts and I have had to explain to the marshals the what and why, that I feel is less than ideal.
In terms of finish there isn't much competition, the Krytac has a beautiful finish. The Krytac also takes a wide array of magazines whereas the ICS requires modification unless you use their mags which are actually pretty terrible.
The Krytac is the better gun, it has better internals and shoots faster and more accurately and is that nice standard gun that is compatible with just about everything. The APE on the other hand has a lovely split gearbox but its otherwise an inferior gun.
