Even though I am in HO, over the years, I have built, or helped to build several N scale layouts. I'm currently helping a friend build his, which was one that I designed. He's using Atlas flex and Peco turnouts, all code 80. He has some older locomotives that need that size rail.
I can tell you guys that it doesn't matter which brand, or brands of track you use. Your success will depend entirely on how well the track is installed. You have to make the track "bulletproof" to the rolling stock. So that when you test it,( I've always tested track by backing a train of my longest cars, 85' passenger cars) around the layout. I make sure that I hit every track, even spurs as fast as possible. I've tested my personal layout using a train of 12 full sized passenger cars, pushed by a brass locomotive, or 2. There are places on the layout where the track is a good 5' above the concrete floor. There are many places where there is nothing between the track and that floor, but air.
I've never had a derailment doing this test on my layout. Now I realize that many if not most N-scale cars have truck mounted couplers, and backing a long train of cars with these trucks and couplers is almost impossible, but if you shorten the train to 4-5 of your longest cars, you can get the same results. Using a sectional track, no matter the brand, can double or triple the chances that a slightly bad joint, will cause a derailment. The cure is simple, make sure that the joints have been dressed with a file, so all running surfaces match. Also make sure that the rail ends touch each other within the joint. I currently am handlaying all my track, including turnouts, (except my hidden track), and each joint is dressed like this as the track goes down. A few swipes with the file on both the top, and the inside of the rail will ensure a smooth transition from one piece of rail to another. And yes, I've even built some N-scale turnouts as well.
Remember: The better your track is laid, the better it will perform, no matter the brand(s).