As so many have noted, it depends on your goals and both N and HO have distinct advantages. For me, I wanted to more realistically model Harpers Ferry and points west. On my N scale layout, the two Potomac river bridges are each 90% to scale in length. Just could not do that in HO in the room I have (the main bridge would be 12 feet long!). I really love the look of long trains crossing the bridges. The advent of 3D printing has made a wealth of small parts available, so you can more effectively prototype scenes. Reliability and the detail level of locomotives has certainly improved. Sounds not as good due to the small size, and switching is I think more challenging. All in all, given my goals, N scale works best for me.