"Joshua Putnam" wrote

The mullions on vinyl are in between the panes

That's one of the bigger drawbacks we found when considering replacing
our 100-year-old windows -- we definitely don't want windows that look
like someone put strips white electrical tape on them, which is what the
between-the-pane vinyl pseudo-mullions suggest. They're about as
attractive as wood-grained contact paper on a station wagon.

The mullions in the dual glazed are just like what are found in some
Andersen & Pella, unless the Andersen & Pella have the snap in grid (Yuk).
As you can see, the design is also done with wood windows.

Most people find when purchasing a century home, they end up being a money
pit. The ordinary average Joe doesn't earn the income it takes to properly
restore a century home with properly designed windows/copper gutters/slate
roof etc etc. So they end up looking for alternatives which include doing
nothing at all. Or, having an old house slapped together. I think you're
finding this out already, by looking at vinyl windows for a century home.