If one has the room for long trains and runs, and, at a minimum O72 curves, Scale looks great and would be a satisfying way to go.
If nostalgia is important, Traditional.
Lots of people here run Traditional and Scale on their Scale layouts, however, and Traditional sized trains look at home there too. Not so sure about the other way around, most Scale trains, IMHO, look just wrong on curves of less than O72
