Just found this topic and thought I'd "join in".
I have used Unitrack in both N and HO and have found it a terrific platform on which to run trains. Have always stuck with the #6 turnouts ("points"), as I prefer the look (and have read about some issues with the #4's.)
Have just recently been "playing" with some OO stuff (the reason I joined this group), and find both Hornby and Bachmann locos are quite happy on the Kato track. I also have a small shelf-type layout with Micro Engineering flex with Shinohara "points"; both code 83, like the Unitrack. The Hornby loco tends to bump rather aggressively over the Shinohara points; it travels very smoothly over the Kato product. The Bachmann, with its finer wheel flanges, is happy on all 3 brands of track.
For whatever that's worth...
Mark in Oregon