I favor the two N decks, too. But that's because I'm operation-oriented, and thus favor small scales in general. However, if I think about it... it looks like the HO and N layouts are modelling the same geographical area, and I'll guess the same time period. If that's true, then I see no real benefit to the two scales.
Fan of late and early Conrail... also transition-era PRR, 70s Santa Fe, BN and SP, 70s-80s eastern CN, pre-merger-era UP, heavy electric operations in general, dieselized narrow gauge, modern EFVM and Brazilian railroads in general... why bother trying to list them all?