I have American OO. I have a few working Lionel OO Hudsons but they aren't in this video. You may recognize a few Lionel OO cars.
I have used GarGraves OO track in the past, it was nice but no switches. For my layout in the video I hand laid the track so I could have a switch. The hand laid track is really smooth, looks good but takes some time to do. Hand laying track is easy to do and worth a try if you haven't committed to a track system yet.
Chris