Archiviz windows, noob question.

Finally making myself stop watching tutorials and start trying my own project for the first time.
I’m trying to model a small block of apartments and i have a question about the windows.
Should i just use a plane for the glass or should i be using a cube? (or even 2 cubes for double glazing) Also is it best to model each pane individually or is it ok to model just one for each opening and have it intersect the mullions? Hopefully going for a photo real look.