I run both. Depends on what you want to do and have honestly. Me personally, if I could go back in time, with the knowledge I have now, I would have left N alone.
Don't get me wrong, I love how they look, and the space savings. But N, is soooooo labor intensive as far as maintaining compared to HO. Along with that, the mechanical aspect of working on them(installing decoders, troubleshooting, building structures, e.t.c), that, yes I have them now, so I have to take care of them, but ugh... The contrast between the two scales become immensely obvious, when they're staring you right in the face constantly. I have made only one change/update to the N trackwork, while my HO has constantly evolved.
That's simply my opinion and experience on "actually" running both over time on my layout and it's associated growth.
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