As for tracking, yes the Kaos is more pattern-ee. But I placed a small dorsel fin under my Koug and it fixed it right up. The Koug can achieve higher speeds and better climbs, but the Koas does naturally track better with that long tail moment.
They are so similar, that I would not consider having both of them in my fleet at the same time.

Having sung the praises of the Kaos and Koug, (the Koug being the favorite of all time for me), There are some awesome ARF quasi pattern ships these days.

And while I'm speaking of alternatives, the little Kobra is a kick !!! All the tracking and even performance of the Koug, but with a slightly smaller landing envelope. Folks are really stunned by the performance out of that little plane. We used a 32.

The Kougar is still for sale on the Sig site. I had heard that rumor myself, 13 years ago. Thats when I ran out and bought my Kougar. That is such a great plane, if Sig does stop selling it, then we know something is very wrong at Sig !!!